Have the radiator either boil flushed and rodded or replaced if necessary along with a new cap and upper/lowers radiator hoses. If your going through all that money to have the water pump and thermostat repaired, do everything else to prevent another failure and ensure no overheating.

1989 Montero LS LWB
Rear LSD, KYB's, 3.0L, Lockup A/T, 2" BL, T-Bar Crank, 33" MTZ's, Full Length Roof Rack, 9k Winch with custom bumper, Rock Sliderz