will J heads work on a 318? And many many more questions.

ya ya those are the ones you want. those are the same chamber as the magnums if i remember right or darn close use those and clean the bowls up and port match them to intake and try a smaller cam your stock pistons are in the hole like .120 the performer might be a good cam but I would look into the smallest comp thumper they make a reg hyd flat tappet cam for us mopar guys now it closes the exhaust valve earlier and helps build compression and gives you the sound of a larger cam they just dont like to rev real high like past 5800 but you shouldnt need to rev yours up that high anyway also what intake are you running