360 compression issues. pick a piston??

This depends on the piston; you can get a dished piston WITH a quench pad. (That assumes your 65 cc heads have a closed off chamber above the valves, which they should if they are Edelbrock clones.)
Example: KB232

The Speed Pros as above are in the hole a bit without decking the block, and so won't get the quench at standard deck height. (I have found 2 different compression height spec's on them, so that exact number is still a bit murky.) Even the KB232's need a bit of decking or a thinner head gasket to get the quench gap down around .040".