It doesn't matter which post on the distributor cap the rotor is pointing at. As long as you wire it starting with no. 1 from there, and wire the firing order from there it does not matter. If you can turn the dissy, far enough to get timing set properly, it does not matter which post on the cap you start with. You do not need to pull your dissy back out. Put your motor at TDC on the compression stroke, pull the cap off your dit. and see where it's pointed, and wire the ignition from there.