Yes, the vacuum advance canister. I haven't had a chance yet to try your suggestion Jon, but hopefully I can this evening. I do believe without looking that the advance line connect to the base of the carb.
"The greatest use of life is to spend it on something that will outlast it" ~ William James
'25 Chevy Superior '66 Chevy C10 '03 Chevy Silverado 1500 HD