No doubt it's tight. Dropping the whole exhaust will help but that will be a challenge too on stands. Try to loosen the ex. bolts. If they snap, no biggie. The threaded portions at the manifolds are replaceable. Get the torque converter bolts early and then drop the rear mount. Get the flex disc off so that it will drop even lower. That will give you all of the room that you get to have access to the top bolts. Long extensions and flex sockets will get them. It will still seem impossible but it can be done. Large hands and forearms won't be an advantage here. You just gotta believe and it will come out.

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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