what dyno don said sounds good . one carb one this? two afb 650 cfms or holleys i wound do. sounds like it is botteleneck. at 10 to 1 and 671 with 112 centers. 10 psi it should make easy . how good is blower sealing on intake and what is the vauuum on the top. the carb when the boost drops and is the blower in good shape?? a nosealed could take more than 1 to1 but i think it is the carb and air cleaner and i hope you have a big ex