1990 inline 6 cylinder.4.9L How do I find out if it has jumped time??

Right now I am confused, I have had problems with this engine for a while now.Yes I have had the distributor out, and yes I have moved it a couple of teeth , but it is still showing it is timed on #3 cylinder.Or at least that is when I can find the timing notch.. I want to get it back to #1 cylinder... Can someone tell me if there is an easy way:mad2:
Thanks
Sonny 32