Will the distributor housing turn? Grab the housing just above the vacuum advance with a big pair of channellocks, and turn it back and forth. That will help work the penetrating oil down between the housing and the block. Eventually, the distributor will start to move upward, as well as side to side.
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!