It was early when I read your post, didn't even see the talk about the leaking coolant. I'd replace the water pump as part of a timing belt job. It's probably leaking from where the tube that runs between the heads connects into back of water pump, theres a little o-ring seal that goes in there.

1989 Mitsubishi Montero SWB V6, Aisin manual hubs, gen 2 front brakes/rotors, rear LSD, A44DL lock-up transmission, BFG 33's.