In addition to turbo67camaro's information, you'll want to consider the brake balance that you want to build into your system. Normally you would size the MC bore for the front caliper (twin 43mm in this case), then the rear and then adjust the rear bore (typically increase in order to reduce pressure) to set the baseline balance of the system. This should take your ride height, weight distribution, tires, etc into consideration as well as the range of adjustability of the balance beam setup for optimal performance, but a 65/35 or 70/30 split is fairly typical.
A balance bar system generates a linear relationship between front and rear brake pressure based on the bore sizes of the MC's. There is no "proportioning" involved unless you install a proportioing valve, adjustable or otherwise, into the rear system. The only adjustment is on the beam to shift your balance front to back or vice versa.
It's actually a bit more involved than that, so I would strongly suggest contacting Tilton and discussing your application with them as they seem to have the most helpful technical support IMHO, nothing against Wilwood or CNC Brake.
Tobin
KORE3
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