Holley Main Body Upgrade Question

Your AFR from 30-about 40 shouldn't be influenced by the main jets yet. If your mixture screws don't change AFR much, you probably have too much of the transition slots exposed. What do your transition slots look like on the bottom? They should look like squares, or close to it. What about timing? where ya at for initial timing?

I probably should have mentioned I have 4.10 gears if that makes any difference. I would think so (now that I think about it) since I'm revving higher than typical cars.

As far as the transition slot, I set that with the carb off the engine. The transition slot looks like a tiny square. I made sure of that. Also, I set the curb idle using the rear (secondary) throttle blades by turning the screw from underneath the base plate.