im doing a rear disc brake upgrade on my '88 vert. all the articles say to use a master cylinder from a 1993 cobra or s/c, the rearend is from an '88 t-bird s/c, i have access to a master cylinder from a 1995 mustang gt with 4 wheel discs, will that master cylinder work? also would anybody happen to have an adjustable prop valve they would want to sell?