Same as others have said. My '63 195 dieseled badly as well. Found the vacuum advance line was attached to a ported vacuum source on the carb which had no vacuum at idle. Moved the hose to a constant vacuum port on the intake manifold and the added advance at idle increased the idle speed substantially enough that I was able to lower the idle at the carb throttle position which totally eliminated the dieseling. Much smoother idle as well. I ALWAYS prefer vacuum advance at idle, and personally have never had a vehicle that I didn't feel like it ran better that way.
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Hoping to finish a project while I'm still able to push the clutch in.... 
1963 Tempest Convertible (195-1bbl, 3-speed transaxle. 428 RAIV, 5-speed, IRS planned) Pictures
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