The previous owner had installed the engine. After careful inspection, it was apparent that everything had to be taken apart and reassembled. Why reuse a 30-year-old engine-mount-to-block bolt and then add a flat washer and a lock washer on top of the seated bolt head? Note the oversized washers and lack of washer on the engine-mount-to-frame-mount bolt, as well the unfilled gap between the parts. The gap will allow the metal to bend during torquing, thereby reducing tension in the bolt, and in a short time the metal will flex and fatigue, causing the bolt to quickly loosen. These errors exemplify what happens when you put a lot of money and effort into the big stuff and then cheap out on what keeps the whole thing together.