Originally posted by SpooledupRacing
going in a chevy CAR (not truck).. not sure what yet...

mainly drag however I would like it streetable for weekend crusin
roughly 400hp or so 11's would be a good aim
twin turbo setup
For 400 HP, why would you go thru all this expense? You can get a Gen III 6.0L engine (364 CI), install a LS6 cam and LS6 heads/intake and get 400 HP doing nothing more than swapping parts. These engines have 320-345 HP right from GM and they aren't that hard to find (and for a lot less than rebuilding a complete engine). Toss a Magnacharger on that combo and you'd have well over 500 HP.

Is there a reason you think you need a turbo or a supercharger? These systems are expensive, and for that amount of HP, they really are not needed.

The flow characteristics for the Vortec heads are for cars with EFI. Without knowing what car the engine is going in, how will you know what oil pan to use? What accessory drives will work? I think you need to rethink this just a little bit. I don't start any project without think the whole thing through.