MP distibutor

just got a MP distributor new. i have the motor on top dead center and the oil pin gear distributor slot pointing to the front of motor. ok the old distributor was ok but i decided to buy a MP DIST. The car ran OK pulled the old out and the new MP rotor will not line up with the number 1 piston when installed. whats up with this am i doing something, help.or should i start my number 1 wire rotation were the rotor is pointing?