I don't have a IMCO but thought about adding them to the next boat?? If they are not standing behind them??? My understanding (from Advertising) IMCO should be stronger than a XR, if so 675 should not be too much HP, And a 37 AT only tips the scales under 9000lbs, is not a heavy boat for the size??
My thoughts, 50 hours and need a rebuild, kiss my ass and replace with something else.