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I would venture a guess to your question... Since the truck is 35+ years old the original transfer case may have been replaced with a junk yard one that already had the kit in it and did not know about it???
From what I have read here a stock 203 will not move the truck if the front drive shaft is removed and transfer case is in Hi (not lock). Apparently my 203 has a part time kit as the front drive shaft is removed and the truck will move in Hi. I quess my question is being that I have full time hubs is it possible for any damage to be done "IF" indeed there is a part time kit installed in the 203??