Originally Posted by Gord&Fran
There should be no gasket between the insulator and the carb. Putting a gasket there blocks the vacuum port.
I have always used a gasket between the insulator and the carb.
37-54 gasket
54-62 gasket

I have never had to use a gasket between the insulator and the manifold. But, using one (to stop/avoid a leak) would probably cause no problem?