The '38 wheelbase is probably the same as the '40 ? I didn't have to shorten the Dakota frame because the one I have is a short wheelbase '89 Dakota 111.5" which is almost identical to my '38.

'65 Belvedere II - 446-Indy,727 transbrake,Dana 4.56


'38 Plymouth 4Dr - 408SixPack, A518, Dana60 4:10