Well, I'd bet the farm that it's right handed,
but an easy way to check is to put the boat in reverse while tied to the dock. If most of the propwash is on the starboard side it's a right handed prop. My 270 is a '94 with a 2 blade prop, head to head against newer 270's I can walk away from them quite easily. The newer boats have 3 bladed props and 130 gennys, I'm running a 150 genny with the 2 blade. I suspect that the genny is more of a factor then the props.