I have a custom tow bar that I hook to the back of my newer gmc to move it and we rock it back and forth a few times and let the clutch slip on it a bit but nothing so far. I will remove the dist. tomorrow to see if the oil pump is seized maybe i can prelube with some fresh oil to get the mains moving. and the electrical has been home to a few mice over the years so I won't be using the starter. Any ideas on where to find the block casting numbers?