When installing a different engine, or just removing the A/C system and bracket, always remember to plug the top hole on the passengers side of the block next to the mechanical fuel pump inlet. If you do not do this you will have and oil leak and probably replace your front crank seal more than once and recieve multiple headaches. I had just went through this and actually found the leak on accident. I asked everybody that I knew, and they had no suggestion. But then all of a sudden when I told them what it was, they all said "oh yeah, I went through the same thing with mine." *******s!!! Anyways, I thought I would share this and request that it be a sticky.