If it's a "married" unit with a motor mount sandwiched between the transmission and the transfer case, I doubt it it's old enough to be a NAPCO transfer case. I believe all of them were mounted separately, with a short driveshaft as a connector. The later models had a cast iron rear motor mount bracket that served as the splice between the units.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
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