Thank you all for the input.

Yeah, this is a tough carburetor to tune, I'll say! There are two mixer nozzles in the front base of the carb and a third in the back that seems to be for curb idle mixture (that's three mixtures).

I may have the thermostatic coil too lean, but I think I have the three nozzles too rich.

I finally found a MOPAR Master Technicians' Service Conference bulletin for 1968 Carter BBDs and will have to read that. I do know now my carb is a 68 on a 66 car.

Spito, spitero, huchtooey splateus!
1958 GMC Series 100 stepside
1954 Chevrolet Bel Air 4-DR sedan
1966 Chrysler Newport 2-DR hardtop