well the pump is not cheep, I have changed the timing belts on 2 of these, without doing th epump, and ended up taking everything off less then a month later to change the pump.
my openion, change the pump tensioner belt, and adjust the valves while you are at it.
along with the standard compression check, vacume check, ignition timing check, all the usual round you do at about 50k, and if there is somthing in there you done know how to do , just ask manny ppl on this board to help
