I used the '95 master cylinder with an adjustable prop valve and have no problems either. I used all the parts from a '95 stang. Go to this site
http://svo73mm.cjb.net/
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1985 Mustang GT Cobra
Mostly stock. Flowtech 1 5/8" lontubes, flowtech h-pipe, Flowmaster two chambers, Mac 2.5" tailpipes, MSD-6AL with Blaster coil, Weiand Stealth intake, Eibach springs, Monroe Formula GP's.