I have a 350 punched .30 over with stock heads, with crossram. I need to know what cam should I use, and what carbs, Holley 390's or 450's ?

Most of my driving is street, and roadracing,

you need to give more info what year , trans, gears, whats in the block you say stock heads ,from what what pistons ? compression ratio?

1980-85 Chevy 350 .030 flat-top pistons, Stock crank & Rods
333882.....74-80...350/400......76cc chambers heads
M21 4 speed Manual Trans
Possibly a 3.36:1 to 3.70:1 rear end not sure. It in a 1976 corvette L48

With a crossram. I need to know what cam should I use? and what carbs, Holley 390's or 450's ?

i m no expert on crossrams but are you sure thats the best way to go with 3.36 gears and low compression ?i think you would have a much better driving car with a dual plane manifold and single carb you just don t have the components to match up with 2 carbs in my opinion maybe someone else has experience with these or you could call Edelbrock they can give you their recomendations for both cam and carb good luck on your project

I already have built many high horsepower 350's Now I am trying to build a 350 like the
GT Le Mans cars, yet keep it streetable. I know about the highspeed cam that was used on the crossram Z/28. That cam takes bigger carbs and doesn't work so good for street applications. So I was reading up on the AMC with a crossram but can not find any info on the cam size used.

yeah, thats what i was meaning its just not street freindly, and those heads don t flow don t know about the AMC version tho you might be onto something still think a call to Edelbrock could give you some help