intake manifold height difference

Any body know the difference in height between a performer RPM and a M1 single plane for the B motors (383-400)? going to the M1 on the new motor and want to know if I can reuse my air pan.

It will be interesting to see your results. Some of the guys have gone back to the RPM. Will most likely depend on the combo. Not many have liked the M1 that have had something else to compare it too.

Performer RPM 383 (non-EGR)Installation Notes: Recommended intake gasket: #7225. Manifold height.: A-4.90", B-5.80" see A/B Measurements.