I would find someone that can diagnose the problem properly. Low compression could be caused by a number of things. What they will need to do is a cylinder leak down test to pinpoint the problem. I know GM had a lot of issues with cam shafts from about 07 through 2010 where the lobes would wear down and cause all sorts of issues depending on how bad they wore. I agree white the ones that said stick with what you have in there as changing engine sizes will cause more headaches than it is worth. 360 hours in nothing one one of these engines unless it has been run very hard all it's life.
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