From what I can gather, Oldmics, if you've come-up with a forged 312 crank, you can likely advertise viewing hours with a donation required for the privilege.
After the viewing hours have run their course, the crank could be offered on eBay.
Using some old barn wood, square nails and the lettering / numbering stencils I've got, we could make-up an 'original' FoMoCo shipping box and label it with the part number CITE 6303 $FX$ I'm not sure what the eBay reserve should be set at...
I bet it would cause some crazy bidding
... and you could retire to the land of 86 degree wind chills that you're enduring today.
NoShortcuts
a.k.a. Charlie Brown
near Syracuse, New York