I had to make a spring loaded spool valve to replace a pinned valve among a few other spring selections. In a gasser v/b there is no 1st gear valve per se. You have to use the amplified governor pressure to kickdown into 1st. Its not as easy as it sounds. There are about 4 valves in play to make that happen. In my coupe I did the exact same mods and it wouldn't start in first. Thats a large part of the reason I'm working on a 722.6 swap for the coupe. I've spent too much of my life in a 722.3 valve body. I know for a fact that if your pan gasket doesn't tear the 9th time you tighten it, it will on the 10th.

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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