What was your normal 60' in the heat with the Air Gap? My Dart with a pump gas 340, hydraulic cam, ported Edelbrocks, Weiand X-Celerator, 4.30 gears, at 3300# went a best 1.530 60' and would go 1.55-56 in the heat.

The 10.9-1 408 in it now with the same heads, flat solid cam has gone 1.41 untuned with a Victor on it.

IMHO the X-Celerator is a very underated intake, I've seen them run hard on 340/360s and strokers too.