Performer rpm or M-1 intake

With that cam, I'd bet there is almost no chance a single plane m1 does better anywhere except maybe the last 500rpm of usable and the 500 range is being generous. That won't make up for the giant hole down low compared to an RPM intake.

Plenty of people have swapped from RPM/AG intakes to M1's and the car ET was slower. MPH was almost identical.

If you have room, try the RPM with a 1" open spacer.