I looked at using parts or fitting a JXLD to a Studebaker US6.
From memory the block was slightly longer and the inlet manfold on the JXLD was slightly longer and would not inter change with a JXD one.
I think JXD series on motors the fuel pump could be fitted either side......one side used a push rod and the other side did not.
Also as you mention JXLD.internals slightly different and alot harder to find replacement parts if needed......JXD parts are much easier to find.
The timing case bolt up I think was the same.
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