Dyno'd the Magnum.

74Burntorange said

I see no difference in either and Im willing to bet that it flows better than an eddy or makes more power.

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This tells me you have not seen the two of them side by side. What are you basing this bet on? Have you compared runner sizes? plenums? port dimensions? How much?

74Burntorange said

Also might depend on the motor it is on. some guys have used it over the M1 and picked up MPH and 1/4 time

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Could be because someone stuck an M1 on a low RPM motor, also might depend on someone's skill (or severe lack thereof) at tuning a carb on a single plane intake.