I'd take him on the roster for 1 or 2 years at a reasonable rate. Despite slowing down, u can put him on basically any of the top three lines at any given time. I don't know why people worry about where he fits.
Morrow has barely anything left to give: his speed is shot, hard to be effective at his game with his legs right now. At a VERY low contract (i.e. less than 2 mill), I would be fine with him on the fourth line while occasionally moving around, but otherwise, I'd pass. I'd rather go for Jagr, who is still an excellent PP option, even if I would rather Montreal just rest on free agency completely from here on out.