Well, if it was a ........Ford!!
Not saying they are better, but with it on the front of the engine you can get to it with a big honking pipe wrench.
Don't know if its peculiar to Fords, but over the years I have seen two dizzys break off right under the bowl leaving the rest in the engine.
At that point, on one, we took a hammer to the rest of it and was left with just the shaft sticking up.
Been a while, but as I remember, we lifted the shaft up as high as we could, and sawed it off.
Then, after the rest dropped down, we put a shop vac on the hole, and sawed a slot in the stuck part letting the vac pull the filings out.
When we got through it, it loosened enough to slide out, and then we pulled the rest of the shaft out with either a magnet or a small grabber tool.
Don't remember which.
The other one, I had to leave right after and don't know how they got it out.