At least on SB ford engines, and most of the other on this forum unmentionable V8 brands that I had, if one wants to "line up" the rotor the method is to pull up the distributor so it disconnects from the driveshaft. If you "milk" it in and out of position the rotor will walk arond to the wished positin. You also have to help it slighly, the shaft is hexagonal so it wont fit on the drive in every positin, the camshaft gear does that. Lift - turn rotor until its in correct position, down, if stop, lift a bit again and correct rotor position, the rotor turns as you push down.
If you try it, it is wery easy if you dont have your thumb in the middle, use no violence, then reposition spark cables. I can not imagine that the Y should have been constructed anyway stranger than most V8s regarding distributor drive. Most 8s have rotor set to point at nr 1 cyl at zero if Im not totally gone in my recalling the unmentionables.
Best regards Per, in a snowy Seden.