Heads are where the power is at everything else you do is to make most of what the heads have available.
Take your combo and swap different heads on and you'll come up with vastly different power levels and bands. Eg.. 318 heads vs 1.88 360 heads vs Edelbrocks vs trick flow each one is total change the powerband and power level.
You could go with bigger cam but your probable already getting 90+% of the power out of those J heads.
