The pontiac motor doesn't use a pushrod or the cam for the fuel pump. It has an eccentric cupped roller on the front of the top of the timing chain. As it comes around it rides on that pump lever pushing it down and then relieving pressure as it rides up. So what happened to you is it was preloaded w/ pressure on the lever when you loosened it. So now when you try to put the old or new back in the lever is hitting the roller and not allowing you to line it up. Be careful don't try to start the bolts and pull it in that can cause other problems. Just turn the motor a little by, hand is best, about half way and then push the pump up to the block w/ the lever a little down when putting it in so it rides under the roller. If it goes flush easily bolt it up after doing your gasket. If it doesn't line up just move the motor a little again till it does. Tighten up the bolts and you done. Now that it's bolted up as it comes around it will push the lever down and pump. Don't muscle the pump in there that lever takes alot of pressue to move. Good luck Jim
