Well, I did the exact same swap you are talking about. I bought the 502 Ram Jet.....I put it in my '72. I would recommend going with 1-Ton Drivetrain. I am running 350 Tranny with a Shift Kit...no problems there....yet, NP205--D60 and 14FF. I would also recommend getting an O2 Sensow kit for it, These engines run exteremely rich, since it is a Marine motor. I bought Hooker Headers for my Application, because of how narrow the Framerails are, also had to do a little rearranging of the Firewall on Drivers side to get the V.C. to clear (3" Body Lift also--definite bonus). Let me know if I can answer any Questions for you.....Good Luck.