Re: 1966 c20
Hello Hantke,
Were it mine, I'd follow FetchMeAPepsi's advice to find out where the leak is (or where the leaks are). Then you can solve the problem (or problems), rather than just trying a lot of potential hopeful solutions.
If the carb is leaking at the gasketed joint, I'd set each part on a cast iron table saw table (or similar flat surface) to see how much it is warped. If it is warped a lot, it's likely to leak regardless of gasket thickness. If it's warped a little, a standard new gasket might work, though you will still probably get some leakage and orange varnish build up on the carb's outside.
You rebuilt your carb so you can do just about anything: way to go.
See if you can discover where it leaks and keep us posted. I'll work from this end and try to keep Minnesota's recent chill away from Texas for a while. No point in freezing your fingers while fooling with carburetors.
Regards and Good luck,
Culver
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