Copied and pasted from Hughes website:

.LIFT......IN.........EX
.100_____66_____N/A
.200____116______91
.300____177_____138
.350____202_____155
.400____224_____167
.450____239_____171
.500____252_____174
.550____262_____176
.600____263_____177
.650____263_____179
.700____246_____179

That's better than OOTB Edelbrock RPMs.
The chambers are much better too if they
are the same as the Magnum heads.