Best answers:
1. ask your head porter for the flow data (bias), and what cam he recommends, if he builds engines with these heads similar to yours. If he doesn't, take the flow data to Harold Brookshire, etc.
2. duplicate the cam choice used successfully in an engine as similar to yours as you can find - especially size, head casting and porting, rocker ratio, and manifold.

What not to do:
Average, interpolate, or "take the best of both" from more than one model.