Anybody go from performer to an rpm air gap

crackedback said
On a 430ish horse 360 with a 275HL, there was almost no difference between an air gap and a performer 318/360. The performer was cleaned up at the port openings, but, it wasn't matched to the head.

Each had a 1" open spacer and 750 DP carbs.

I thought I have heard several story's along the same lines that there would be no noticeable difference.