1967-72 C40/50/60 chassis swaps?

[Swiftshifter68]

Just wondering how close the width is on these, might match up to the body of one of the old Medium Duty C40/50 trucks? I've got a line on one with a blown head gasket MKV/VI 454, 9' Service bed too. I remember seein' a link to a Facebook post by a guy with one of these chassis under his 1964-66 C50/60. Looked pretty good. Also, found a handful of complete, old RV's languishing in a local yard, guy there said I can pick/choose any of 'em for $250. I've read that I want the P30 / Fritos truck chassis, disc brakes, etc. Thank you for any info'!