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.