Call a dealer and see if the part numbers on the distributor match for the year models. OR if you used the distributor off the junkyard engine there may be an issue with the pickup. Also the plate behind the crank sprocket that the crank sensor reads could be bent or misaligned. I doubt timing is messed up if you say it runs well. However, IF it is a little off you may perceive it runs well, but it's out. A dead giveaway usually is a vibration felt in higher RPMs like 2000 and up. Someone could see the cam/crank difference on the DRB data and know almost immediately either way. The two different types of sensors you are talking about are, as I remember, 12" and 18" pigtail. No difference in the rest of it.