Nice looking engine, especially w/ no white aluminum oxide in Canada. What stops the fuel flow is the pulling up on the rod which goes down to the injection pump. I don't see the issue which Alec describes, though could be true. The Rube Goldberg linkage on top of the valve cover is to transmit the cruise control input, EGR sensing and such. It appears some designers had too many beers.

Did anyone remove the vacuum "shutdown valve" on the rear of the IP lately? If so, it might have been reinstalled incorrectly to push on the "more fuel" lever (is supposed to pull back on it).

You might remove the locking bolt (10 mm socket?) on the rod adjustment from the firewall, since that might be preventing full travel. Likely it was removed when taking off the valve cover. I post a photo of my 1984 & 1985 CA linkages in case it helps. Good luck, sounds like an easy fix.

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