Originally Posted by Aeroplane
If you can find a frame closer to your size without going nuts, do it. That is a pretty big size difference IMHO, and probably won't be fun to deal with.
+1. And it's a motobecane, which may mean French threaded headset and
Swiss threaded bottom bracket, assuming it's of a seventies vintage. While these are certainly "problems" easily overcome, if you plan any upgrades you either need a shop familiar with these issues (very few, IME) or need to figure it out on your own.