Plugging Timed vacuum advance hose

Mattax said
I've also run into this problem of part throttle and high speed cruise pinging when both the mechanical and vacuum advance comes in too quick for the fuel. With more recent fuel (past 15 years) I had to back off when vacuum advance came in, and with the Mallory built MP distributor, also slow the upper part of the mechanical advance curve.
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I am experiencing the same thing with my 318 Swinger. Just the stock 2 barrel and Pertronix conversion. I need to see if the vacuum canister is adjustable. If not I need a replacement. Last summer I filled up at a out of town car show. **** gas pinged right away. I pulled over and plugged the vacuum advance hose so I could make it home.