Well I have just converted my neighbors kid from ricer to muscle. I gave him a ride in my Elky with a 498 and the following Sunday I see a really straight 66 Elky sitting in his driveway! He came over that afternoon and ask me if I would help him and his dad build a new motor. I said "OF COURSE"! Anyway I need input from the small block builders to help me wild "little" 383 not daily driver.

Pump Gas compatible?

All we have right now is the block 350 4-bolt

Thinking.......

Eagle rotating with SRP pistons? Need help with compression, flat tops with .020 deck, .038 gasket, etc. nets about 10.7 (May have to deck it too) Too much even with large cam? What quench should we shoot for?

Vortec Heads, reworked for more lift (up to .600) and ported (he can get this work for free through a local machine shop friend)

Depending on cam/ RPM air gap or Single plane?

Cam.... thinking around 300* at the seat on 112 LSA to help with the compression. Talking about a hydraulic roller (street) Don't know if the new Voodoo line will have something that big? We need to bleed off some cylinder pressure!

It will have a 3000-3500 stall with gears once we determine the motor set-up.

Please throw some ideas at me

Maybe PDQ will respond but I understand putting a cam over around .500" in a Vortec headed engine is useless. The flow drops way too much.

Set the quench distance between .035 and .045". For a cam with 300º duration you'll need about 11.5:1 CR which is very high for a pump gas engine. For 10.7 use a cam around 288º or so. I'd use a Scat crank before using an Eagle crank. I understand they have better QC. Eagle rods are fine. You can save quite a bit of money by using Wisco ProTrue pistons. They are very nice.

With this setup you'll want decent gearing - around 3.55 or 3.73 for the street or 4.11 for the strip.

Personally, I'd go with a cam around 280º and set the compression for that cam (around 10.4). A 383 isn't a high rpm motor and about 6000 is as high as it should wind.

Here's one plan,,,
Vortec's normally run about 62cc's so figure from here. You can cut them some if you like for more compression.
Your .060 quench is probably not the best in the world.
10.7 is doable but I would keep it about 10.0 with iron heads.
Vortec heads set for .550 lift (any more is pretty useless), SRP 138103 16cc dish, .039 gasket will give you 10.0 which is all you really want with pump gas.
My preference is Scat for a rotating assembly, cast 9000 is all you need with the I beam 3/8" 6" capscrew rods. It will internal balance without any extra weight no problem.
They also have a 7/16" bolt rod I really like that you don't really need but they are very nice & cost only a little more than the 3/8" bolt ones. ;)
9.00 deck height, (zero), Hyd roller cam of your choice, something like the Comp XR282 but I would prefer 108 separation.
RPM Air Gap, 750HP.
It should make close to 400 hp & about 450 lbs ft. on an honest dyno,,
Put a good head on & you should have 450+ HP