a set of Kelsey Hayes SBP A body discs would keep you SBP or a set of 73-76 A body (Ebody might be the same also) BBP discs if you want BBP & they increase the track some & you would need the UCA from the disc donor car (if getting them from an A body, E body UCA'S would not work). with them you would want to get rebuilt calipers from a '76 A body for the larger (2.75") bore and brake hoses from a 78 volare (just cut half of the bracket off that is crimped on in the middle of the hose). I think Doc has a tapered spacer sleeve (need 2) that would let you use your current UCA's with 73-76 discs