Joel, since the basic configuration of the motor is already established........ I would think the biggest influence on power output will be in the induction system.

I don’t know if Hot Heads offers a race-ish oriented 2 x 4 manifold, but if they do, that might be something to explore if the set up you have seems lacking.

Of course, a properly set up Hilborn stack injection on alcohol would work pretty well on that combo too 😎