I had been searching for a pre-built motor similar to what I had used for the 800 with no success. Everything I had been able to find was either a basket case or a shipping nightmare. So I decided rather than roll the dice on someone else's problem I would have an engine built to my specifications. Luckily I was able to track a great candidate just a few hours away. it had came from a low mileage 97 Mach 1 but I'm guessing it had locked up after sitting for so many years. After removing the head I couldn't see any obvious signs of damage so it is something in the bottom end.