Actually, lt looks like stay length was the same for 412 and 414 as the 510, 710, and 910. The difference primarily being the tubing and the head angle. While I hope you scored with a 531 or Columbus frame, more realistically you have a 1980 412 or 414. The primary difference being the components. For the components you still have, the big difference would be the crankset, which for those two models, is pretty minor.
http://www.vintage-trek.com/images/t...0Trek3_150.jpg
If it were me, I'd restore it to an original color, decals, and components. You won't make any money out of it, but when done, it wiil be a nice, solid, bike.
EDIT: This even looks like your color:
http://www.vintage-trek.com/Trek_galleryTF414.htm