Looking at your picture then mine it looks like your vacume advance is clamped to far up .I would use a piece of coat hanger cut and bent straight then use it to measure how far it goes down in the engine in the oil pump slot then compare that measurement to the distributer .here is a Picture from Deves site.
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Last edited by KEVINSKI; 01/19/2022 6:09 PM. Reason: Spelling

1954 Canadian GMC 9300
"The Journey"
Follow in the DITY