Factory discs, as in '67 factory discs (small bolt pattern)? Or are you swapping to the '73 and later big bolt pattern discs?
Use the upper control arms for the brake system you're using. Small bolt discs use your existing small ball joint uppers, big bolt pattern brakes use the '73+ uppers. You can use your existing steering box & center link with a '68-'72 idler arm.
