Distributor Swap Question
Caution, Some distributor shaft keys are oriented different. Aftermarkets are good examples.
^^Pay attention to this^^ What he means is that the rotor in relation to the drive tang is different on some distributors. There are a couple of ways to deal with this
WHAT I'D DO:
1.."Wrench" or bump the engine up to the TDC mark on the damper. Pull the cap and see where the rotor is pointing. It should be either no6 or no1 plug tower. MAKE NOTE of this. Make note "for rough timing" the position of the vacuum advance
2..Pull out distributor and examine the old beside the new You should be able to tell if the drive tang is at least "close". Orient the rotor so it goes in and points the same way, and likewise the vacuum can, and install the new unit
3...Now note if the rotor is till pointed to the same plug tower as the old one, snug down the bolt slightly so you can time it.
4..If the rotor is NOT at no1 above, just move the plug wires one or two towers whatever it takes to get no1 back "to" the rotor position
5...........And reset your timing.