How much did you pay for AFR 165's?

Ive built basically the same engine, but with early gt40 heads. Its got a 600 holley, performer RPM, 1.7 roller rockers, and full length headers. If they got 400+ hp from the AFR heads, what can I make with the gt40 heads? I know theyre not as bad-ass as the AFRs, but theyre still miles ahead of the chokey E7s.