Intake swap, poss gains?

IMO...NO..it will not help you out....

I would stay with the eddy air gap...

Our 71 Duster uses the eddy air gap....probably the best dual plane intake ever make...runs hard up to 6500 rpm

Someone else swapped out an air gap for an M1 and the car's 60 ft slowed down...there was a thread about it on here