recently picked up a 1971 horse, double pulley/belts on same shaft. am leaning towards putting on a Honda 8 hp (GX240-TROY 34. description says: ANY OF THE ENGINES AT THIS LINK WILL FIT TROY BILT HORSE TILLERS THAT ARE THE OLDER (2) SPEED UNITS. A 2 SPEED HAS FORWARD AND REVERSE (ONLY) WITH ( NO...