The head and cam towers are the cam bearings, there are no traditional shell bearings. Supposedly the towers are mated to the head but M/B is pretty meticulous in their machine work and I haven't ever seen problems in mix and match setups. You want to make sure you put the towers in the correct locations and just check to be sure there is no binding of the camshaft with everything bolted down. If that checks out I wouldn't have any reservations.

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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