The BEST thing to do would be to replace the timing belt, tensioner, all idler pulleys, and water pump (assuming pump is spun by timing belt)
but sometimes that is way too pricey. If that is the case I would at a minimum put on a belt, water pump (if you have not had it changed recently), replace any idlers that are not perfectly smooth spinning, and closely inspect the idler.
With those miles you may want him to make sure that you crank and cam seals are not leaking as well. Having the belt off is a good time to inspect that and repair if neccesary.
Shoot'em close. Less to pick.
They might get my guns, but they'll get the bullets first !