It looks like most of the metal is there and in repairable shape but whatever is missing may be hard to find. One point not mentioned so far is the nostalgia angle. My family had two '36 Plymouths, a '40 and a '50 as hand-downs when my grandfather would trade in his Plymouth by trading my Dad's earlier Plymouth and giving us the later model. As a kid I recall a lot of low income adventures trying to keep those Plymouths running and they usually had a tractor-like low gear ratio; especially the '36 model! What I am trying to say is that I was a Fordnatic as a teenager and rebelled against the constant stream of Plymouths as straight-six dogs but my Grandfather swore by the MOPAR hydraulic brakes during a period when the Ford mechanical brakes were scary at best. So for me a '39 Plymouth would be a time machine back in memory lane and I would try to put a 318 into it and I would offer $1000 with the idea of trying to get it. For you with other projects it would seem there is not the nostalgia aspect so unless you have a MOPAR obsession it would be better for somebody else to bring it back to life.

Don Shillady
Retired Scientist/teen rodder