Missed on this combo?

If you had reversion going on,(no saying you did on didn't)having a smaller intake port would break up the exh air trying to go buck up your manifold. aka my have given you more bottom end. So may have been if you had installed a carb spacer that was designed to control reversion. There are all kind of trick/bandaids(depending on how you look at things) That could have improved this combo.

This is Just my opinion but if you get the chance to re test these head, with their improvements. Let Brett Miller and anyone who is or was involved in these heads, along with the cam manufacturer of your choice, design a better cam.
Think about this. you have already had a custom cam built and have data on two different heads(dyno pulls) to build a better mouse trap.
The only negative to this approach is that it won't be apples to apples test...................

EDIT talking about using a smaller intake mouth then the head. In reverse the air hits the wall made by the smaller manifold mouth.