You will need to use the drive adapter and muffler off of your original engine. You will have to by pass the key switch and change the throttle and choke control to remote if you use the 356447-0079 engine. The wiring may be slightly different, so if needed, you can use the wiring harness off of your old engine. You may have to use the oil filter bracket as well. You may also have to use other minor parts off of your current engine If you use the 356447-0079 engine, the flywheel fan and shrould is 1-3/8" thicker on this engine than the 350447 series. If you drive of the flywheel side of the engine you will have to use you shroud, flywheel and stub adapter of the old engine.