Depends on what cam is in it now and what future plans may be in the stew pot. With stock heads the cam choices are restricted some. I would think go with a cam, even if the heads are the choke point. Then later the heads can be dealt with. Uncle Tony is doing up an engine using mostly stock parts. Yes, an aftermarket cam. Valves are being replaced in factory casting heads. Porting with DV and Unity Motorsports involvement. They are using the Carter 2 barrel carb also, so the build is a bit like a restrictor plate engine. Aluminium heads not allowed. Will be interesting to see the results as head work vids come out and the final dyno result.