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I gotta admit, I'm too lazy to read through all 165 pages of this forum, so maybe someone can tell me where to go. (That happens frequently)

Anyway does anyone have any info on interchangability of NV4500 to the older SM420, for instance? According to one thing I read, it appeared that some early 4500's had the standard bolt pattern to allow direct bolt up to the old bell housings. Conversely, it appears that all the later 4500s have the Dodge bell housing bolt pattern. Any info or direction to applicable reference material would be sincerely appreciated.

I realize drive shaft work might be involved, as well as throwout bearing hassles, but those are to be expected.