I don't see how missing bushing #50 would affect the manual "stop" operation. That is on the "pedal input rod" which is just along-for-the-ride when you push the stop lever. That lever pivots on the bushing in part #21, and the IP input rod comes directly off the stop lever. You can quickly pop off all those extraneous linkages w/ a screwdriver to insure that none are preventing full rotation of the stop lever. Also, unbolt the pedal input rod, as I suggested in post 6. If you still can't stop the engine, something else is wrong. You never answered my question if you fussed with the IP shutdown valve.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans