Funny --- I was just going to post that the ports and resevoirs are NOT always front for front and back for back! Don't EVER get caught up in that trap! AND some M/C have internal proportioning valve so adding an external unit would be a serious degradation in pressure (reducing pressure that has already been reduced!).
A quick revue of how the M/C is set up is to WATCH the fluid in the reservoirs as you slowly apply brake pressure - the FRONT brakes should be applied FIRST so if you see fluid movement in one reservoir before the other - then that tells you which one should go to the front.
Another arguable point to check on is that everything I have ever read - and every brake manufacturer I've talked to (Brembo - Baer - Wilwood) will tell you to run 3/16" brake lines when using disc brakes. Disc brakes work on pressure (volume is critical as well but we're talking about your average street car here...). Smaller diameter M/C make higher pressure. A 7/8" bore M/C is making about DOUBLE the pressure of a 1 1/8" version with the same amount of effort applied.
Personally I have a motor that makes almost NO vacuum due to having 8 stack EFI -- so I save the vacuum for the MAP sensor... when I changed to this manifold - I eliminated the power brakes and went with a 7/8" Wilwood M/C -- I have big azz Baer discs all around -- and I can tell you that my braking improved by 500% !! It takes little effort to brake effectively and I swear the brakes work so much better! I had the "Corvette" M/C (disc disc) before with a dual booster... but with low vacuum so the pedal was always 'hard' but without the resultant braking power. Now, I'll throw you out the front window if I stomp the brakes.
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