This is called initial timing. I had to show my younger brother how to do this on his YJ last week. You need to find Top Dead Center (TDC) on the firing stoke, right after it blows your finger out of plug #1 hole. Once you have that put the distributor in, with the cap off,and make the rotor button point to where spark plug #1 wire will be. You will have to make sure the oil pump shaft is in the right position. Bolt the ear down and give it a shot. If you have a buddy around have him hold the distributor in place and turn it until it starts up. Find the position where it starts up, then pull the distributor out and ever so slightly turn the oil pump shaft until you have the distributor in the right place. Once you get it you will always remember how to do it haha. If you need me to clarify anything send me a PM.