Bill,
I like the S10 m/c because it is light weight and aluminum with a more modern look. The old Vette m/c is cast iron, rusts quick and is hard to make it look nice. I run in the Vette circles and many guys have trouble with these as rebuilt units for a variety of reasons. I would suggest you avoid the Vette unit.
I am NO brake expert, so take what I say with a grain of salt. I am running a set very much like this on my project car. I used a prop valve from a 1981 Vette, which is the same 68-82. I felt this would work far better than a manual unit that would need final adjusting, expecially since I won't be seriously competing the car through Solo II, etc.
It is my understanding you will need some sort of valve to limit the pressure on the rear.
Remeber too that m/c brake lines are backwards from what you might think. The smaller line in the rear of the m/c goes to the front brakes and the larger line in the front goes to the rear. Don't ask me why, that's just how they are.
Good luck with it!!!!!!!!!!!!
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