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Well, i think those are FSM (Factory Shop Manual), so same as paper.
Those are .pdf books, previously pointed:
http://www.73-87chevytrucks.com/techinfo/7387CKMans//Service/X8432_1984_GMC_Light_Duty_Trucks_Service_Manual.pdf...
our law is tighter - no other parts allowed in historic plates. OK, tires, battery and wiring changes are allowed (with right time cloth isolation of course).