that fuel ratio works for under power, but for cruising, it's to rich, 14.7:1 is the perfect ratio for cruising, 12-13 for power, try changing metering rods (bigger ones) for the part throttle, this will lean it out, 15" of vacuum isn't bad at idle with that cam, the last time I had mine running, I had 6" at idle, wonder what I'll have with the new one, going to use a vacuum pump for the brakes this time