Well I was going to do some upgrades to my L48 and I'm still doing it but found a deal on some different parts. Here is a list what I bought a Edelbrock Performer RPM intake with a Holley 4150 650 double pump dual feed carb, Comp Cam Kit Magnum 270H to go with what I already have. Here is a list what I already had & all the work that was done.
ZZ4 Heads 58ccchambers valves- stainless steel 1.94 intake 1.50 exhaust
springs-Comp. Cams- part# 986 1.43 o.d Dia. 132@1.75 seat load 293@1.25 open load 1.15 coil bind and 322 lbs. rate. Retainers- Comp.Cams- part# 740-16 super lock retainers 10deg. lock angle
Rockers- Comp. Cams- part# 1417-16 magnum rollers 1.52 ratio with 3/8 screw in rocker studs.
WORK
Complete 3 angle valve job, bronze guides, cut for PC seals, machine spring seat ,drill and helicoiled bolt holes, resurface .005, pressure test, and springs shimmed.
All this along with some shorty headers to go in my 77 with TH350 with B&M shift kit and my new 3.70 rear. I had planned on using a Comp Cam 268 with a stock L82 intake and a the Holley 650. But I got a deal on the other intake and cam kit from a friend of a friend that never had a chance to install it in his car. I talked to a comp cam tech and told him what I had and ask what he said it it a good setup and felt the hp would be some where around 350-370hp. I was hoping to get somewhere around 330-350hp so any extra will please me even more! Do you all think is the comp cam tech close? How good do you think it will run in the 1/4 mile? Guestamate?

 

Looks like a good set up I would guess mid 13s in the 1/4. I did a gear swap like that in my Cutlass. The high revs drove my crazy trying to keep up with traffic on the highway! Just saying

 

Yea my rpm's are 3000 at 60mph that is about the fastest highway speed around here unless I take a longer trip then some speed limits are 70. I would guess the rpm's would be around 3300-3500. I has a 65 nova and put 4.10 gears in it and it turned around 3400rpm's at 60mph. I built a 355 and it balanced the engine specs was of a 70 LT1 solid lift cam only with 10.5 comp and trickflow twisted wedge heads with 1.6 roller rockers, edelbrock performer rpm intake with a holley 750 double pumper dual feed and it ran in the low 12's on street tires and 11.89 with drag radials @118mph. I wrecked it banged 2nd gear at 7000rpms and got a way from me ran off the road hit a tree and turned over what a ride for what I can remember. It knocked me out when I woke up I was upside down. That was a Bad A$$ car and I miss it. I would trade my Vette for that car in a flash!!!! Now that I'm almost 50 I've calmed down some!!