Thanks, Some good info.

I heard the templates were a waste of time:
the Mag article I'm using.
https://www.motortrend.com/how-to/mopp-0507-cylinder-head-porting/

Excerpt from Steve:

Critically analyzing our modification plan for the intake port, we started at the bowl area just under the valves, and we could see there were areas where large flow gains could be had. Blending the bowl and opening up the valve job to a spec closer to the full potential of the valve size will usually result in large flow gains. However, gains in these areas on the Magnum heads were modest. While there seemed to be plenty of flow left on the table in these areas, the bowls are proportionately large in comparison to the tight port runners. In contrast, opening up the pushrod constriction unlocked a substantial amount of flow, as did reworking the obstruction at the guide boss. It seems the Magnum's large bowl and small runner work together in kind of a happy harmony, with a balance of flow potential that requires mods at each end of the bowl and runner to significantly impact the overall port flow.