toymachine, if you find you do need an alternator, PM Archion, he has good sources on larger truck parts. The regulator sounds like the normal Ford style of that era, there are solid state replacements. Archion may even be able to hook you up with a 3G alternator.
Bill Vose (Old School Hot Rodder)
1986 F350 crew cab DRW 460ci EEC-V MAF/SEFI, E4OD, PMGR starter, 160 amp 3G alternator, 12X3 1/2 rear brakes, Traction lock 3.55
1995 Lincoln Continental (project car), 1994 Taurus LX (daily driver)
"growing old is inevitable, growing up is optional"