I'd start by checking for spark as I have a 350 mercruiser and every year I have trouble with spark and it generally winds up being the points. Borrow a timing light to see if you have spark at the plugs while you crank kit over, if you don't have spark clean the points and try again. If you do have spark pour some gas in the carb to see if it will start. If it starts and stalls repeatedly it could be a number of items, fuel pump, clogged filter, water in your gas, stuck float. good luck be patient
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