Holley Carb Jetting Help, Lousy Fuel Mileage

We're probably going to rejet the carb back to 66's now that the distributor is in phase and the 8.5 vacuum can is installed. We noticed that the insides of the exhaust pipes are black, so its definitely running rich. After rejetting we'll slowly lean out the idle circuit and see how it goes..... Be nice if I could find someone in my area with a chassis dyno and a wideband O2 sensor.....