Big D,
They only produced your model from '54 to '60. I would think the longer you keep the tractor the more residual value it maintains. Both the gas and diesel tractors were fine machines in their day, and I know a few who would never part with them - even long after they've been replaced with newer tractors.
If you make the time and have the patience, it will be a very rewarding experience. Although some may state that the tractor, in restored condition, will only fetch $4K - $5K...I'm reminded that you can ask just about any price and eventually get it should you decide to sell.
Here's a picture of a completely restored, upgraded Ford 'N' and the owner was asking $25,000. (Ridiculous ?? Maybe - but I believe he got near his asking price). It is *The* most beautiful Ford restoration I've ever seen pictures of.
Mark