Plugging your numbers into an injector calculator comes up with 275cc injectors to reach your target assuming you run a m/b 4 bar regulator and leave 20% headroom. I'd be tempted to go with something a bit larger maybe 300 to 325 cc in case later tuning surpasses your current target. Not that it matters much in your build but I'm sure that wouldnt be too large for good low rpm manners.

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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