RPM Airgap?

The Eddy Air Gap is, of course, designed for a square-bore carb, whereas the Eddy Performer is spread-bore. I never liked the way my built 360 ran with a Eddy Performer RPM and a square-bore carb. It seemed like it had poor fuel distribution. But I really like the way it runs with the spread-bore Performer and a big ThermoQuad. Never understood why Eddy never made the Air Gap in spread-bore.