I have done some back to back dyno testing on the Mopar M1 single plane with the 4150 carb flange and carbs versus the Eddy Torker 11 and the Eddy performer RPM, none on the Indy intakes. The torker 11 was the weakest in HP and torque, the RPM intake was better on HP and torque below 4500 RPM, the M1 and the RPM came out real cose on the "average results from 3000 RPM to 6000 RPM" with the M1 single plane performing better above 5000 RPM. No real at the track testing, sorry
BTW, I ended up using the RPM in the car, it was a 1965 Plymouth satelite bucket seat, console, power everything with air conditioning pump gas street car that ran high 12s corked up on pump gas on BFG radials