I have a montgomery ward tiller, the model number looks to be an 8 or a B. Does this look right? 2nd is the serial number # 039-14AB239B, 8 horse power rear tiller. Not sure of the year. Has two shifters on the deck, one on each side, one to shift the transmission and the other to shift the tiller. Can any one help me get a operations manual and a parts manual. The date would be nice to know if possible.