That is going to be a neat project. I'll actually be looking for something like that (55/56 Dodge or Plymouth)eventually for the Poly/Hemi engine I'm building.

As far as locks and keys I found it's sometimes cheaper on hard to find locks just to pull the locks and take them to a lock smith to have keys made.

1957 Plymouth (Hemi, Dual Quads, A833 4 Speed 9 1/4 w 4.10) Sold
1937 Dodge Pickup (Hemi, 6X2 intake, 46RH, Dana 60 w 4.56) Sold
1968 Plymouth Valiant 2dr sedan (354 HEMI, 46RH w/4.30 gears)