IS SER # B08817568 CORRECT FOR A 1988 6 HP EVINRUDE ENGINE? ENGINE NOT SEEN YET, IT MAY BE LONG SHAFT . WHAT IS THE LENGTH OF STD Vs LONG SHAFT FOR THAT ENGINE.<br /><br />1966 33 HP JOHNSON CARB IS FOULED AND WILL NOT STAY IN ADJUSTMENT. COULD A NEWER CARB BE INSTALLED. I UNDERSTAND THAT THE ADVANCEMENT LINKAGE MUST BE MAINTAINED.