I have removed the #1 delivery valve several times to check fuel timing and had no leaks. I re-used the copper washers and didn't heat-anneal. I just rubbed them on 600 grit sandpaper against flat steel until shiny. If I lost one, I would try one from my boxes of Harbor Freight copper washers. It ain't rocket science (my day job).

If the guts of the delivery valve come out, check a diagram carefully to re-install. There is a thick disk that needs a certain orientation and you can barely tell in the FSM drawings. I had to do a Google Images search to be assured.

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