The Quiet Line are a fine garden tractor. Yours looks very nice, by the way! I have a 1450 that I just installed genuine Cub Cadet replacement iso engine mounts. Up graded to the cast iron oil pan, and bran new 1" front wheel spindles. Mine has the rear lift, 1/4" rear wheel spacers, IH rear wheel weights, has 10 grease fittings on the tractor alone! I also have a nice muffler crutch, rear back up light, as well as front and rear tail lights. I have a 50" mower deck, and the tractor is being set up for snow blading with my nice IH 42" push blade. I also have a thrust bearing in the Ross automotive steering box. Shimmed the front axel for any lateral play, rear disk brakes, and the engine cradle modification. Mine is a hydro, and the trunion repairs have been made. New pump fan, and rag joints from Cub Cadet.
Your 1200 looks really nice! If its noisy, start by checking the hood hinge. They were a better up grade from the previous wide frame series. You can tighten up the hinge with vice, pin, and hammer. I also recommend adding another ground wire to the engine, the same as what's currently used for the bendix starter. Your 1200 looks so good I don't think I'd want to work it too hard! As a matter of fact, these IH Cub Cadet Quiet Line models are very good, cant beat the cast iron transmissions either!
When you get'er cleaned up I'd like to see. Be happy to help if I can!
thanks
John L.