I really don’t think V/P clearance will be an issue at all for the proposed build if an “appropriately” sized cam is used, and the heads/block are not excessively milled.

2315’s with the heads/block/gasket situation set up for low 9’s CR shouldn’t present any problems with a suitable street cam.

The stock eliminator guys get it done without valve pockets(pistons have to be stock configuration) and much bigger cams than what this build will get.