just bumped into this......
there are a few things that can be done. As OP expressed, "I like to make power at much lower rpm." This is typically done by focusing on port velocity, and then working the ports. Typically you work the bowls and seats first to optimize velocity
1) once you pick an engine, learn about it - especially learn about optimum valve angles for the cam[s] you want to use. (lower lift cams may benefit from shallow valve angles then big lift cams)
2) measure intake valve diameter - adjust throat diameter to 88% of the valves diameter - (bigger may help, but also approaches too big)
3) minimize the valve guides intrusion into the bowl
