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I can only offer this information: The military 302 has the bellhousing specific for the Hydramatic transmission, and that bellhousing is special for that transmission and is not in any way similar to a modern Chevy bellhousing or anything else for that matter. When you remove the military 302...

In my opinion the perfect swap for the G749 GMC's is the gas 366/Allison found in the 1980s/90's Chevy mediums (school bus, Uhaul truck). The first gear is low enough to approach low range on the hydramatic, and the 366 can handle 4000 rpms all day. Still will get crappy fuel economy like the 302.