402 Big Blocks are nice but they make the front end soooo heavy that its crazy (mind you, when you open the hood up it looks a lot better though). I still have the original block and rearend (M20 4 speed long gone, I replaced with M22 Rockcrusher) but I'm feeling the inch to go modern with it. Lets say LS9 with TKO 6060 6-speed to back it all up (this is the current setup in the $100,000 Corvette ZR1).