Overall mounting the engine was fairly easy. The first 3 bolts went in without a hitch. I was following Jim Norman's Illustrated guide to hanging an engine! The only problem I ran into was getting in the last bolt. I ended up making a drift slug by cutting the head off one of the mounting bolts that came with my engine crate. It was the same size as the mount holes. I ground the end to a bullet shape. Drilled the rear of the pin with a slight concave surface, made it about 1.5 inches long and then simply started it into the hole, with the close tolerance bolt behind it and lightly taped it into the hole. Worked great! Cost nothing.