It may help to check the three timing marks on the engine: Crank pulley mark @ 0 (TDC), Distributor rotor at #1 (should be a notch on dist. body) and cam mark on the bearing tower. If all three are perfectly in line at the same time, then the crank, cam and distributor are in time with each other. That would be a good starting point and then you are not second guessing yourself. The IP timing is done differnently and Joe A. has a few posts about how to do that.