Sweet Find!! Yup i would try to make it run before you pull it to swap out the freeze plugs. Atleast you will find if it needs a further tear down required..
I have it running off a gas can but the fuel tank and pick up was one of the nastiest I have ever dealt with. Its currently getting hot tanked. After that I need to get the brakes all rebuilt and working. Then it should be ready for a shake down drive around the block.
