Good day guys, I got a 1988 30 hp Mariner, 2 cylinder one carb, serial number 30 ML 689 L 331200 that was submerged 5 years ago, and I just got it running. There's a bolt that I noticed is cracked of that's bolting in the faceplate for the power head i.e. 968-7194M CYLINDER HEAd. My quandry...