Pulling the engine for new freeze plugs

Had to laugh at your post 'cause my 318's freeze plug behind the flywheel is leaking a bit too. But i have no excuse; i forgot to replace them before i dropped the motor in recently...

To answer your question, i currently have the 9.5" factory setup in my 65 and i 'upgraded' to a 10" clutch without a problem. I believe the one i used was for a later model truck. Either way, i believe that the ones you listed should be ok and i've put on ~1000 miles on the setup without any issues. I bought mine from NAPA and had the old one to compare with. Believe i posted the part number in a old post ; i'll search for it...