Mike,I had a '69 GP with a 428 and it had also sat for a long time.The motor was also stuck,so myself and a friend pulled the engine thinking the worst.Ending up being the top of the cylinders had moisture in them from sitting.Ending up going .030 over and the crank stayed std/std.When we took it apart it ended up being the cleaniest engine the friend of mine ever pulled apart and he does that for a living,Good Luck.
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