On the 104.980, leave the water pump alone unless you absolutely have to replace it. There is a pipe that runs from the water pump back to the oil cooler at the oil filter housing. Once you disturb the pipe you're almost guaranteed to leak coolant at the oring in the oil cooler. Being that it sneaks under the intake manifold its a pretty big PITA to pull the pipe to replace that oring. If you are unfortunate enough to have to do the water pump, plan to replace the oring. Its a little easier while the pump is already out of the way.

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90 300TE 4-M
Turbo 103, T3/T04E 50 trim
T04B cover .60 AR
Stage 3 turbine .63 AR
A2W I/C, 40 LB/HR
MS2E, 60-2 Direct Coil Control
3" Exh, AEM W/B O2
Underdrive Alt. and P/S Pulleys,
Vented Rear Discs, .034 Booster.
3.07 diffs 1st Gear Start

90 300CE 104.980
Milled & ported head, 10.3:1 compression
197° intake cam w/20° advancer
Tuned CIS ECU
4° ignition advance
PCS TCM2000, built 722.6
600W networked suction fan
Sportline sway bars
V8 rear subframe, Quaife ATB 3.06 diff