I got some time yesterday to look over my new acquisition and all is not as great as I thought. The 250 in it sits way too high and I think forward from the original 235 location. The floor plate has been torched for the shifter tower to protrude into the cab and the front core support was also torched for a radiator of unknown origin to locate forward. I took a few pics of the cobbled mess last night. If I'm going to pull the engine and start replacing the mounts correctly, I'm thinking I'll just go ahead with a small block install instead, as that's what I want to end up with eventually.
Pics are in the link. truck pics

1952 Chevrolet 6400 flat bed