the best way is to 1st make sure that before you drop the dist. into place the #1 is on tdc,balancer mark on 0 on timing marker then align your oil pump drive looking through dist. hole with bottom of dist drive [ the divider on the bottom of the dist. gear] the oil pump drive must line up with this or the dist. WILL NOT drop in all the way so that you can put your hold down clamp on.The oil pump drive if looking FROM FRONT OF MOTOR will be approx. at the 11:00 and 5:00 oclock position. make sure you put your rotor bug to #1 on dist cap,and in order for this to fall into place you'll want to turn the rotor counter clockwise just a bit before dropping the dist. in. it is possible to get 180 degrees out if this happens get your motor back to tdc again and note position and pick dist. just enough to rotate rotor 180 degrees from its position. good luck if you need more help we're here. wjr