Well, it's been a long time coming for me, but I've finally made up my mind and got the funds

Vortec heads 64cc
Edelbrock Vortec Performer RPM intake
Holley 670CFM TBI (if i can get it to work)
Comp Cams Extreme Energy (Grind: 268)
Hedman Tork-Step headers (FL)
TransGo Shift kit
1LE drive shaft
3.73's and a limited slip/posi unit

What do you guys thing? I've been told it'll be good for ATLEAST 325hp/350tq and that sounds mighty good to me

 

do NOT get the XE268 camshaft. You will be beyond sorry that you got it when you try to use it with the efi. It has far too much overlap! The ecm will go crazy when it sees the very low fluctuating vacuum that that cam will make. It can also be an issue as far as lift goes with the vortecs. A good choice for use with the efi would be to use the XE256H-12 or similar realativly efi friendly cam. Itll have enough LSA to make reasonably stable vacuum and the power band should be just right for a high performance tbi car.

 

They make a marine cam in the 268 series that comes with a 112 lsa. Call comp and ask them about it.

 

IIRC they also make one with 114 LSA. You better be real good at tuning the ecm if your going to use something like that, though. The computer's programming and the induction system will need extensive modifications to utilize that cam.

 

You could use a cam like that with EFI, but you would need to be prepared to 1) lay down some cash for a "custom chip", 2) lay down some cash at a tuning/dyno shop, or 3) lay down some cash and a lot of time learning to tune your EPROM yourself. Good luck...

 

Most of those custom chips arnt much better then stock unless the person doing the tuning has full access to the car. Like said above, you probably could use the 268 with 114 LSA but youd really be getting to the very outer limits of a tbi's ability to feed an engine. It only has around 500 cfm of flow capacity in terms of a carb. Important if you have your peak power high in the rpm band.