I put the Mutha Thumper in my 350. Basic rebuilt 350 4 bolt block with nothing special just the normal bored out, forged flat top pistons, ballanced. Rebuilt heads with stock springs. Runs good, sounds, mean. Had to install a 2000 stall in the TH 350 trans with 3.7 gears. Even power brakes works good. Vey streetable. Almost willing to try the BIG Mutha Thumper in my ZZ Fastburn. Ken