I have b-car 12" front disk and Baer on rear. No problem. I installed Baer's when rear end was out from the car. Stops great but I have GTA 4 wheel disk master cylinder w/vacuum booster. I will tell you this is not the hot setup for drag strip as the disk do not keep rear wheels from pushing you thru the starting lights!
Let me know if you want to sell the Baer's as I know someone looking for a set.
Conrad Carter
North Carolina