Johnny,
Man, if it's running and all of the pieces are there, you got a great deal. The important part of the serial no is the end, 635218, which tells you that it was built in Sept/Oct of 1978. The first part of the serial no. is the Kind Code, 205. The next part is the Machine Code, 0660 which does stand for a 1450 model tractor.
The 1000 series Cub Cadets were some of the most popular, and were built between October 1974 and August 1979. They were the first Quiet Line cadets, and the only ones to utilize an ISO mounted engine, where the engine is mounted on a plate, with rubber bushings between it and the frame. They were also the first to utilize a fully enclosed hood, quieter muffler and engine shrouding to help cool and quiet the engine, self dumping hydro units, and Kohler engines with seperate starters and generators, unlike the older cadets with Delco Starter/generators.
Personally, one of my favorite CC tractors. You should watch the engine because they are prone to wearing out the ISO mounts, and the replacement mounts are better than the factory originals. The gear drive models are much more prone to doing this, but if yours was used as a Tug, you will probably want to go ahead and change them before they screw up the drive shaft coupling. You can tell by grabbing the engine and shaking it side to side. If it moves much, replace the ISO mount.
Yours is one of the later models, which means that it may have the 1" front axle spindles, which was a much needed improvement. The tractor is the second series of the "wide frame" cadets, so most of the CC implements you look for will fit it.
Get some pictures up when you get a chance.
Congratulations,
Bill
The 1450 is a powerful tractor, and 2nd largest next to the 16hp 1650.