SBP DISC to LBP DISC SWAP- 72 Swinger

Hey guys I need to do drum to disc on a 72 Valiant. I used the list above and found a 85 Diplomat and got the set up last weekend. Now I see on Mopar Action On-Line there is a thread called "Disc-O-Tech" that says not to use the taller knuckles found on 73 and up B/F/J/M/R cars and they should measure 4-9/16" from the back spindle hole to the underside of the top ball joint connection. If taller than this you will change the camber and bump steer effects. Not sure what bump steer is. The Diplos are about 1/4" taller. What will using these taller knuckles do to the car steering?