Like I eluded to earlier, you definitely want to match the cam lift to maximize the full potential of what ever aftermarket heads you go with.

Couple things that you may or may not have thought of. Your stock compression ratio with the stock heads (58cc chambers) is reported as 9.5:1, but I don't know how close that is to actual. I believe your year model L98 used the 4 valve relief dish pistons? If so, seems like GM had two different pistons back then, maybe one at 11cc and another at 13cc? I did a quick search and it looks like some say they had 0.049-0.051" head gaskets and others say theirs used a 0.028 shim gasket. If I were you, if you haven't already, I'd do the research to confirm what pistons and which gaskets your engine should have. If using the same head gasket (total compressed displacement) and you can't go thinner, going from a 58cc to 64cc head would drop 9.5 to fractionally under, but lets say 9.0:1. That doesn't equate to a lot of power difference, but you don't want to give away any either.

Depending on what you find, you might want to see if you can get flow numbers from TPiS for their CNC porting and see if the $1250 they charge for porting your L98 would be a good investment. I'm pretty sure at one time they were publishing around 270cfm, which is a good bit better than the 195 Enforcers.
https://tpis.com/products/tpis-cnc-p...39690120134818

 

I’ve been looking for the original numbers cause they’re pretty elusive, but this is all stage two planning so before I buy anything I’ll be sure to have all my math done. I know the 1010 is a thinner and compatible head gasket, I can also see if a machine shop around me has a good price to shave the enforcers down cause those are 580 or so and if a machine shop can take them down to 60cc or 58cc for a few hundred I’d save some money, get larger valves, better lift, and brand new heads I won’t have to worry about for a long as I own it. But I do wanna say I’ve read a lot of threads and it seems like you know the most about the first system on here so I’m really grateful the help and pointing out things I may not have thought about for my build

edit: did some more looking and according to some online calculators my current is like 9.48 compression which is close enough to 9.5, and after the heads it would plummet to 8.9 even with the thinner head gaskets. But the amount of material it says I’d need to remove to get the 9.5 back is 0.025” or going to 10:1 I can remove 0.043” which seem doable but I don’t know enough to say if I should go up in compression. My concern is getting higher flow heads, bigger valves, bigger cam, then adding more compression on top while not having any tuning experience will add too many variables for me to mess up. Might be worth it though, I don’t want to put the cart before the horse though, I don’t know if there’s a machine shop nearby

 

That price on the Enforcers is for one, $1100 for the pair.

I’m not a proponent of cutting heads much if any - especially if it’s not something I already have laying around. That’s why I was suggesting looking into the TPiS option. Not that much more and if they are still using the program that used to make 270cfm, they’ll be more responsive and make more power then the Enforcers.

 

i completely missed that somehow, well that’s much more expensive, might as well save and get the cnc 180cc ones at that point. The TPiS very well might be a much better option then, though I know a few of the bolt holes on my set need drilled out an helicoiled (another reason I was looking at new) it might be worth the saving. I am just on an l98 platform it’s not like this is gonna be 500hp engine N/A

 

There is also the DNA’s, from what I’ve seen they’re the same cast as the AFR enforcers but they come bare. So I’d have to buy valves and all the spring hardware and rocker studs, not a big deal but still a deal I have to think about. $250 or less for those, they also only come in 200cc which is a bit big for 350, shaving something that cheap though would leave me with less regrets if it goes wrong

edit: thought about it more and figured why not just call AFR and see if they do it, they do on eliminator but not on enforcer which is fine. But they also mentioned that when they mill it they also correct the geometry for milling so everything still lines up which I hadn’t even thought about before (which is rather amateurish) but if I save the extra money long term is seems like having them do that is best overall, might even be able to gain compression too which means even more bang for the buck