Don't get obsessive-compulsive about the dwell. Adjust the point gap to .018-.019 and drive on. Check the gap on more than one lobe- - - -you might have a worn one or two, or a wobbly distributor shaft that's letting the timing change between cylinders. A one-degree change in dwell due to a worn or wobbly distributor cam changes the timing at the spark plug two degrees.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!