Check for rust on the front and rear control arms. The one thing 22RE's are known for is clacky timing chains - if it breaks, it's new motor time. That however will require you to pull off the valve cover (after purchase) so you can see if the timing chain guides are still there. If they aren't there a timing kit needs to be installed pronto. 
ooh, thanks for that.
I bought it and put a couple hundred miles on it yesterday.
Definitely original all over, only two things dont work, power locks, and power mirrors. Electrics are good, I can hear the mirror motors, they are just sheared off internally, and the locks are good electrically, press lock, relay energizes, move locks manually, hear relay de-energize. So new mirrors and new lock solenoids.
motor has a small noise I can only hear with the windows down under load. Could this be the timing chain you speak of?