70mm Accufab is 800 CFM capable, motor perhaps a shade over 700CFM. RPM II can flow 300 with a little work. Used with 3.5” power pipe and no MAF velocities are good.I’d say the RPM ll and the 70mm TB
OP is running strictly street so off throttle / part throttle transitions are important. Now if the cam changes to more duration and tighter LSA, then ya go big induction. I question 6500 rpm, but motor should make good power to 6000.