Is there a particular year GM or Ford EFI system
that could be got from a salvage yard
that has already been successfully used on
1992-1995 Chrysler Magnum V8s?

Seems like my fuzzy memory vaguely recalls that someone
modified the guts from a Ford distributor
and fitted it to a Chrysler LA distributor,
then used it and the Ford mass flow sensors on a Dodge Magnum V8.

Using coil on plug
And doing away with any distributor
Would seem to be a further simplification.