Wondering what some of your et's are. Debating on whether or not to bother with an aftermarket 302 block. My goals are 12.0 and it must be super streetable and be able to run very long distances without overheating. Several people have said that would be easy with either motor. I have thought of doing a turbo build, but do not know if it's needed. Also do not know if I want to deal with the added heat, and trouble keeping it tuned. If it is needed its going to be hard to justify all the money along with the hassle of (rollerizing) an aftermarket block versus going to 351W. That was my original route, but already went through several roller 351 blocks and all sonic tested bad. Sorry to sound so scatter brained but please need some {experienced advice} By the way it will be efi and going in a 67 fastback.Have not decided on what tranny, but do have a 9 inch with 3:50 gear.