I did the V8 subframe swap on my 90 CE at the same time swapping a Quaife equipped diff. Its pretty straight forward. The only thing that isn't an exact match is the bracketry that mounts and routes the ABS sensor cable. Not a big deal at all. You will need the larger 210mm diff, if you don't already have one and the V8 specific cover for the diff.

I did a post about it in the performance paddock, though its mostly about the diff. "3.06 ATB Differential"

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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