I just bought a 1968 Merc 500 w/15" shaft. <br /><br />My questions are as follows.<br /><br />I was told it was a racing motor, that's why there is no alternator/generator<br />on the motor, how can I verify this?<br /><br />Do I go with the standard 50:1 oil/fuel mixture?<br /><br />On a 1964...