Slant six Holley 2280 stalls when stopping

thanks for the input. Ill check and yes cam was degreed at build time.
BTW it ran great for several years then I had overheating problems which I finally resolved a couple or three months ago.
I used the vacuum gauge to set the idle screws at around 17".
I have tightened the carb but perhaps should replace spacer and gasket. Anyone have a part # for these two parts?

Ill get back.