Thanks for all the suggestions. Thought I was going to get to drop the tranny today, but, just did not get that far. I forgot about the starter, so I have to pull that tomorrow, then it should drop. Glad I have been keeping the floor jack under the tranny, hate to break a bolt there.
As to my bolt, of course, it broke off clean with the surface. I think I'll try a combination of suggestions. Heat and drill. Maybe since this is a large bolt, I can get the easy out to hold, keeping my fingers crossed.
I'll let you know where I get tomorrow evening.