I Bought a use outboard the person tha sold it to me said that is a 1983 but he din't look sure.I need to buy parts for it and I don't want to end up buying parts for the wrong year. can somebody help me to make sure this is the right year all I could see in the motor is tha it all black 6 cylinders,3 carburetator is power trim and the cover saids Merc 1500 I think this is the model,because I don't see no model # and the serial # is 620079 and is a Mercury also needs to know the Horse power thank for any help