The problem you are going to have is finding a Crosman 160 in good shape at something near the price of a QB- then when something breaks getting parts for it.
Not trying to talk you out of it- but in my view, older guns, good or bad, shouldn't be relied upon if a full set of service parts is not readily available.
And unless a 160 you find has been re-sealed recently- you'll be taking it apart too, so what was gained?
Also, the '160' copy is the plain-jane QB78, there is the QB78 Deluxe, and while the AR might share the same basic mechanics, it is not a "copy" of the 160 in any way beyond that (it is in fact a conglomeration of "copies" from Crosman and FWB target rifles).