If it were me I would buy a wheel set for the U08, and sell the U014.
That way, you could have a little extra toward your 29'er - and 90% of the benefit that you would have gotten with the "alloy bits" on your U08. besides,
I'll admit I am partial to the cottered cranks on the U08. IMO they look better, and (functionally) they're not really any different from the cottered cranks. Just a little heavier is all and slightly more effort to overhaul.
PS- Maybe someone can weigh in on interchangeability for the cups and bb - I assume the Eighties Quebec-built U014 still had the same threading as the U08, but I could be wrong. If I am, swapping the crank would not be convenient.