There have been instances where people on FABO had problems with 5x115mm on 5x114.3mm hubs. I don't recall the details, but I think sheared studs.

You can get a new set of those with a wide variety of widths on Summit for $800-1000. I don't know B-bodies, but usually the '71 and newer B-bodies have a lot of room for tires under the fender wells.

Summit American Racing Torq Thrust M