Most aftermarket kits have a brass combination valve which must be plumbed into the master cyl. There will be short lines with loops in them to allow for flex and limited movement of the components without cracking the lines.
The front half of the valve connects to the front half of the master cyl.
The rear half connects to the rear half of the MC.
Usually the fitting sizes are such that you can't hook it up wrong.
Outlets to the front wheels are usually the smallest fittings and they are separate lines.
The rear line is one large line usually out the very rear of the valve.
I would guess the rear inlet is on the rear side of the vavle.
Check with SSB on these connections.
Someone here has done this swap. Maybe search the archives here (link, upper right this page) for his name and send him an E-Mail? I know he had some problems with it working right.
Check my web page for First Gen Camaro suspension info:
David's Motorsports page
First Gen Suspension Page
67 RS 327 Origonal owner. 69 Camaro Vintage Racer 65 Lola T-70 Chev 350 Can-Am Vintage Racer