So is the premise that any 318 block and rotating assembly from a similar year will work, as long as I transfer the usable oil pan, pulleys etc off my existing motor? That I can handle. I have installled plenty of engines. That doesn't scare me. I hope to find a drop in ready motor, but sounds like its safest if I steer clear of any truck engines. I never though sourcing a good 318 would be difficult. I can find big blocks all day long. I appreciate everyones input. I think it helped me alot. I did run some the fender tag on my Barracuda. Hoped I had a factory 4 speed....when I pulled up the carpet it became obvious that was not the case based on the hacked in 4 speed hump. Fender tag says 3 spd Auto. Gonna keep the 4 speed though. Thanks again everyone.