I have a 71 340 that is bored .030 over and has TRW forged pistons. With the J-Heads and about 9:3:1 comp. It has a Mopar purple cam(not sure of specs, not the biggest, but not the smallest) Hi-po Mopar elec ign. and Headers, with 3.23 rear end gears. Not a drag car, but hopefully a real nice...