[Ozarkguy]

Correct me if I'm wrong..which is highly possible. Your 74 with the 250 hp 1160 has a six speed Allison with a retarder.. As I remember 1st was really low ..the diff is geared for that.. The Cummings used a 5 speed and the Detroit used a 4 speed.. The reason I suggested the 3208 is because of less doings to make it work. You might even be able to squeeze in the turbo model to kick up the HP. That 1160 has about 125k miles on it and is also a throw away... How many miles do you figure you'll put on the new engine. There might also be a issue on space as the 1160 dimension is different I believe.

Ok ..I'm full of it.. I know..