I took a 392 motor and trans out of my wrecked 1957 New Yorker and it bolted right in my 1960 dodge Phoenix, I had my Father in law cut, fit and weld the Dodge 318 head pipes up so they would work on the 392 Hemi and let my wife drive it while I was overseas in the Army back in 1967 up
My message is that Desoto motor should interchange also, didn't the DeSoto use the Dodge frames and running gear work

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)