My buddy just bought a 68SS (138 car) Chevelle Convertible with a 502 crate Marine motor in it. He wasn't thrilled with the fact that there was a marine motor in the car but didn't care because he has a 68 396 motor he just rebuilt sitting on an engine stand in his garage that he said he will put in the car anyway. He said he just couldn't live with the fact knowing there was a marine motor in his car. The motor only has about 1800 miles on it and sounds great and runs very, very strong. The guy selling the car said about 500 HP. Except for the obvious, (modifying the existing manifold or replacing to acccomodate heater hose)can you think of any draw back to this motor. I actually had heard that the marine motors were stronger and built to tighter tolerances. Anybody else hear that??? This motor runs so strong, I think he is crazy to pull it out and put the 396 in it. Any comments on this situation?