Distributor Removal

Probably all corroded/ rusted/ gummed/ shellacked / cooked up. Can you rotate or move it at all? Try to get some penetrant of some sort down in, soak the **** out of it. Keep re-applying, and if you can move it, keep rotating back/ forth. You can move it further ---the same bracket that clamps to the block goes under the dist, and there is a bolt and another slot there UP into the dist. Remove that bolt to give you more wiggle room. I think some older models were clamped, but may be thinking of (cough gag) Chev

Looks like a fair amount of rust in there. I would tear it down and clean/ lube/ check the mechanical advance, etc. Read the manual. If you dont have one, wander over to MyMopar you can download them free. Does not have to be "exact" you may have to settle for Dodge vs Plymouth, etc.