You haven't really given us anything to go by other than your pistons are perhaps overkill (but who doesn't like overkill
)heads are good (assuming they were actually ported not hacked up) and your EPC's can be made to work well but will need some help, they cannot just be bolted on end expected to run.
Case, mag/aluminium? AS21/41? Line bored, dual relief? 8mm, 10mm?
Crank, Scat, CB, Demello, GB, cast/forged etc etc.
Special cam
Luke