My 68 Dart had a 556 Mega-block in it. I wish I could take credit for it but I bought it that way. It was to have only 20 passes on a fresh motor. Buyer beware! The motor was way tired and had to be gone thru. bla bla bla... Anyways the car weighs 2835 with we in it. The converter stalls out 5300ish. My Dart is a big tire car=32x14.5w, ladder bar set up. That may have to be changed to a 4-link. Its a full chassis car.