1986 Buick Somerset Did my timing belt break?

as I was coming to a stop, I reached for the gear shift to put it in park but didnt actually have my hand on it, My engine just died. I put it in park and tried to start it again but to no avail. We ended up towing it home and there it sits. If it is the timing belt , did I just fry my engine when it died? I dont know if this car has a zero tolerance engine or not.
I need to know this before I put any money into it.
Thank you.