So over the weekend I reassembled the carb and was putting it back on the intake along with new gaskets and a new insulator between the carb and the intake manifold. The old insulator was brittle and broke apart when I was taking it off. In doing this I did not realize the new insulator was a bit thicker than the old one. While I was tightening the carb onto the manifold one of the studs that holds the carb on broke off right above the surface of the intake manifold.

A few questions related to this problem. First where should I take the intake manifold to have whats left of the stud removed and replaced? Machine shop?

Second should I replace all of the old studs or just the broken one? What size stud would I use?

What is the proper order of gaskets under the carb. When I got the car it went in this order. Carb->gasket->insulator(about 1/4-1/2in thick)->gasket->manifold.

The car in question is a 1939 Packard 120 Sedan.