Re: propper prop valve???
The valve you linked is a "combination" valve - it does distribution and proportioning. It was never OE on a 1st gen Camaro. No idea how to tell what it is for - there are lots of different ones that look essentially the same.
In my opinion your best bet when going to aftermarket disc/disc is to keep the factory distribution block and install an adjustable prop valve in the big line to the rear brakes. You can install it up by the MC or down on the frame rail where the factory put their prop valve, and adjust so that the rears won't lock up before the fronts lock up. In the links Brian posted, the only thing you could use with a disc/disc system is the first one (dist block). The other two are for disc/drum systems only.
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