Try them both at the track and make sure and flog the tuning, jetting and timing, for the best results on both on both of them and let us know your results
I don't know the answer your seeking, sorry
The M1 single plane BB intakes have a lot more depth in them than the Eddy, Weiand and Offy single plane intakes I've used in bracket cars, I didn't do testing on any of them comparing them to each others at the track.
I did get to test a Eddy Torker 2 intake against a Eddy performer RPM and then a Mopar M1 single plane 440 on the same day on the same motor on the dyno with the same carb and pump fuel
The RPM was better than the M1 below 5500 RPM at WOT and both the RPM and M1 where 20+ HP better than the Torker 2 was from 2500 RPM tp 6500 RPM IHTHs