The engine is very close to stock with stock intake and exhaust manifolds. It does have a mild performance cam. It is a Crower 280HDP and I don't think it is contributing to the problem. It may be part of the reason I need the #68 primary.
I could get the car to run fairly well with the #66 primary jets but I had to turn the idle mixture screws out too far to keep it from stumbling when coming off idle when in gear.
The car does not have a shaker but it does have ram air. I don't know it is contributing to my problem but suspect not.
The carburetor does not have the check ball, it has the orifice setup and it does not appear to be reamed out. I thought a smaller opening in the orifice might help but I have not been successful removing it to install one with a smaller opening.
I have not tried the technique of checking "flop" as you described. I have checked the resistance to movement up and down with the secondary diaphragm housing off of the carburetor and I would say it does not "flop". Since I do not know exactly how it should respond, I may be wrong in that assessment. I will try your technique but I doubt I will experience the "flopping" that you described.
Thanks for the suggestions.
Do you know the proper size orifice for the secondary diaphragm?
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