[Arran]

If you can get them cheap enough I would buy them Allen-Bradley was a reputable brand, so was Wellwyn, if they are from the 1980s then I would not worry about drift as they had improved the manufacturing technology by then. If they were from the 1930s through 1950s it's a crap shoot, although A-B resistors less so. There were some carbon comp resistors from the late 1940s through 60s that were garbage, the type with the rough finished Bakelite housing for example, they go bad sitting in a drawer.
Regards
Arran