2000 Toyota 4Runner Timing belt

I am interested in buying a 2000 Toyota 4runner SR5, and there is something i just want to be aware of before buying it. The timing belt had snapped on it while it was driving. I know on some engines that when a timing belt snaps, the valves can be bent, yet on some engines the valves are unaffected. I just need to know this before i give him a price for the car.
Thanks,
Dan