I made 324rwhp right around 6000 RPM with this combo:
TFS 170cc heads with Anderson Valve Springs
Anderson B-41 Cam (0.544/0.568, 228/236 112 LSA)
Edelbrock RPM AirGap
Holley Street Avenger 670, 1" Open Spacer
Pertronix Distributor and Coil
Lays down two strips of rubber just stomping the gas from a stop with 3.55s.
sounds like the formula!! Is your bottom end stock or have you gone through it?