ok her's the story bought boat at auction mercruiser sn A679865 170 with power steerin an closed cooling system / baot had NO outdrive bolted on it. BUT inside the boat was a alpha 1 drive with the sticke 4.3L on it ?? so I'm asuming it DIDN'T come from this boat! cause title says 170 eng. looks to be factory can ANYONE tell me WHAT outdrive SHOULD be on this boat?? OR could I run the outdrive marked 4.3L ?