You should have been "concerned" BEFORE the belt broke- it doesn't matter now-
So should I look at the valves?
I know on some engines you don't have to worry about the valves. It didn't make any strange sounds when it broke, the car simply died.
The good folks over at http://www.yotatech.com claim most of the belt-driven toyotas were clearance engines, but you can search their site for more detailed answers.
Looking for a Used 4Runner in your area?
CarGurus has 20,760 nationwide 4Runner listings starting at $2,495.
Search Toyota 4Runner Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Toyota 4Runner Experts