I recently purchased a xlt that I was told was a 95. the tunnel has a manufactured date of 01-11-1994, and the hood has a 40 year anniversary tag 1954-1994. So the sled appears to be a 1994 xlt special. However the engine has individual black cyl. heads (not the mono head) with "polaris 600" cast in each one. Is this engine from a different year, and been transplanted? I need to go through this sled, but need to know what it is before I can prepare it for a ride.