head porting

Stupid questions are those unasked.
Given the other parts - I'd think there's probably something else that's holding you back too. So I'd do some careful inspection if the heads are coming off anyway. Who spec'd the custom cam and is the valve job quality there? Reason I ask is I've used a Crane hydraulic with a similar intake lobe and made a lot more hp on a stock piston 440 with my ported 516 heads and a 6bbl.
Porting will help. It helped my 100% stock Neon and pretty much anything else it's done one. Assuming that the rest of the engine package is matched well and in good order and the porting is of good quality. The valve job can do a lot of what basic porting does if it's done with the right equipment by someone who wants to do a good job. It will also enhance any port work you pay for. So there may be more to getting more power than just porting. Make sure the rings are sealing (leakdown) and have the heads gone through a the same time. Then work with the head porter to match a new cam choice to what you have.