I am running disc's in the front and drum on the rear of my 10 second QT mile 65 beleveder. All I do is swap the brake lines at the master from front to rear, Been doing it this way for 30 or 40 years with no problems with a 2 camber master cylinder. It stops in a straight line at 135.00 mph. No swapping ends at the end of the run. Have been as quick as 9.95 @ 139.99