Proportioning valve for rear discs

Thank you all for the input, only reason I’m even changing my rear brakes is due to the passenger side rear drum locking up/seizing somehow on the highway, was cruising along and everything felt normal until someone shouted that my wheel was glowing red hot..so if I’m going to be messing around with rear brakes, might as well upgrade to discs. As far as the 14” wheel situation, I read that stock rallye’s will clear the calipers, if they don’t I guess I’ll have to whip the grinder out