Thermoquad questions

Couple of comments.
Air valve spring could be broken.....or it might just need adjusting. Adjust to 1.5 turns.
I rarely use the thick sandwich gasket, just a 1/16" base gasket. Never had a problem in45+ yrs of TQ usage.
Carb is a good model & looks to be in exc cond. Best 4bbl out there.

See my tip on this section for improving sec operation.