1964 plymouth valiant Slant six to 340

KosmicKuda said
64 Val has 106" wheelbase. 67 and newer 2 doors went to 108".
Ball and trunnion on trans in 64.
IIRC the early shaft is only 2-3/4" diameter, newer are 3".
A 66 shaft could work because it's the same wheelbase and u-joint.

If it was me I'd get a new one made or a good longer one shortened. I like to do things once and move on without having to do it again later.
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Front wheels were moved forward. The drive train is in the same relationship. He will need a different trans, since the /6 trans will not work with a 340. Did it too many times. Diameter of the driveshaft is not the limiting factor. It is the u-joint, you just need good ones.