If you've hit the starter with it in this condition you can all but guarantee a bent valve (s). The 104 valves are not very substantial and it won't take much to bend one. My guess at this point is that the damper is not installed correctly on the hub. Are all the bolts in the hub? IIRC there is one bolt that is offset preventing the damper from being installed incorrectly. If the damper is on right, the key may have gotten knocked out when the hub was installed. I've knocked a few into the pan myself, its not hard to do. Without the key the hub could end up anywhere.

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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