I seem to remember some of the farm equipment manufacturers using Chevy V8's in combines and other big pieces of equipment. I'll bet some enterprising farmer scavenged the engine out of a junk combine for his truck!
Jerry
I did that very thing for a flathead 6 for my 50 DeSoto in Ronan Montana probably 20 years ago! Got one out of a combine that was sitting in a field! Had to change the front plate for motor mounts, but it gave me an extra 30 cubic inches, same bore so, all from stroke!