[V8] Timing Belt / piston-valve interference?

[Duane Bookshar]

Due (possibly?) to a combination of the recent cold weather here in
Cleveland and age, the timing belt on my 1990 went the other day.  It
happened when I was starting the vehicle.  It started briefly, then died.
Now, not knowing it was the timing belt, I tried some things and tried
starting it several more times.  oops.  My question is, are the valves
definitely damaged?  Or is it worth putting on a new timing belt and trying
it, possibly holding out until warmer weather to dive into the heads??  I'm
new to the list, and any help is much appreciated.  Thanks!

Duane

Cleveland, 1990- 76k