lol, so do I! got it cheap from my brother who upgraded to the Cleveland "some thing or other" (titanium head i think)haha, I've broken a few clubs myself....

 

Don't want to google and post. You can all do that. My info is based on my experience as well as GM themselves went to split duration once they had the tech to figure it out. At the strip you use what works. Single pattern cams with lower LSA work good for WOT open header blasts down the strip and I have found the best times are usually the results of great heads and cam combinations. Street is a different deal. Highest peak dyno numbers are not the end all. My best street results have been with split duration using full exhaust and I have used a lot of single pattern cams at the strip. If you have different results post them instead of insulting my findings. It is difficult to say a 262 or 268 cam is better than a 270 cam. Truth is they are all likely within <5% of each other everywhere and will work. What you don't want to do is reduce timing to eliminate ping because you chose to small of cam for your compression and gearing or drop cylinder pressure big time because you chose to big of cam for your compression. Think I am out of here. OP has enough info to decide.

 

This is called tuning. Each car will be different. That is why we do it. My 355 was up to 600 (13" vac) in drive.(all 8 exhaust rockers changed to 1.5 from 1.6). N vac 17" at 850 rpm.
On my cars, changing the rocker ratio changes duration and overlap and lift, even LSA. So i was expecting to re-set idle mixture and rpm. Set idle back to 550, lope is back, now and then. Graph the valve 1.5vs1.6 and you will see it is not just lift!
BK,
i've told several guys to look up your posts to see how good a 383 can run with a small cam. I would not expect a 383 to be over-cammed w/xe262, but my 355 exhaust was with 1.6.

 

After all this,

Get the XE268H. You will be more then happy with it.

 

That's a nice history on Harold. I was lucky enough to get one of the last Ultradyne cams he made before he had to shut his doors. While discussing my options with him during a long phone conversation I learned a fair bit about cams. I would have learned a lot more if the rest of what he said wasn't way over my head. If you can spend time on the phone with him, do it. There's a vast amount of cam technology lurking in his brain and he's actually willing to share it.

Simple and true.

 

I thought the xe262h was a little over sized for a mild 350 with 3.08 rear gear until I put a 2400 rpm stall behind it. With 1.6 ratio roller rockers on both intake and exhaust it actually ran pretty fair.

 

There is no way you are still reading this post.

But if you are, I called Edelbrock today and Lunati. It looks like your E-streets and my Performers have the same springs #5767 (specs on pg 168 of the 2012 catalog). FWIW the tech at Lunati said that with those springs you could run either the 60102 or the 60103 Voodoo cam without a problem.

 

So are you going to try 1.5 on the exhaust? Driving off on a cold start, no choke,w/1.6E i had to shift to N at the 1st corner stop. NOW W/1.5E it was running so nice i left it in D. It really likes less lift/duration on the Ex!

 

I built a 400 last winter for my vette and have 1.5's on both intake and exhaust. But the carb on the 350 had a choke so I didn't experience those issues.