The brackets for the 104 rail wont line up to anything but the injector positions do line up. So if you can fabricate another method of holding it down it will work. Depending on your injectors you may have to fab some adapters to seal them in the intake. All of the 104 rails should be the same even if differing slightly in construction. I'd think all of the 103 intakes should be the same but I don't know for certain. If anything the 2.6 may have smaller runners but physically it should interchange. Just measure the runners and compare them to the 3.0 ports.

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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