Popping while turning after complete overhaul.

The guys you took the car to know NOTHING about Mopar A-bodies and should refund a good portion of what you paid them (I do occasional front end work and am completely offended at what these shop charge to rebuild a front end - my rebuilds include a hot tanked and painted k-member). If they reamed the taper properly you might be ok, if they drilled a hole the spindle (or spindles) is junk. Check around with other Mopar guys in your area for somebody better to take the car to...