Well, my replacement distributor has arrived in the mail and it looks to be in good condition (but in need of a good cleaning). I am out of town, but I will give the stuck distributor another go this November. When that time rolls around, I'll see if I can free it up with some strikes from a good-sized hammer. If no readily available 'traumatic' force techniques get it out, I'll get a slide hammer and try the puller method that TommyMacDaddy mentioned. With the 'new' distributor on hand, I don't mind if the old one gets cracked or mangled in its removal.