[Steeveedee]

If I am not mistaken, the vacuum advance moves the breaker plate so that the dwell changes some on the 292. You'd want to be certain that the vacuum advance is not connected when setting the point gap. Are you on the 6 cylinder setting of the dwell meter? Can you wiggle the distributor shaft from side to side by an appreciable amount? The bushings could be worn. This usually shows up as dwell wandering around while the engine is running.