Re: proportioning valve
You'll also want a disc/drum master cylinder. You can get by just using a adjustable prop valve to adjust pressure keeping the original master cylinder, but in order to get the full benefit of switching to disc brakes you'll want a disc drum master cylinder which has a larger resevoir to compensate for the addition of disc brakes.
I believe Wes at Classic Heartbeat should be able to help with both parts. If not you'll find both of them on our web site.
GMCPaul
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