85 toy brake problems

so im trying to figure out the brakes on my buddies 85 toyota. we just did a 3.5in bodydrop on it.

hes got 2 master cylinders to use. one is a geo mastercylinder that goes with the booster thats hes got on the truck now. the other is the stock master cylinder. im tryin to find out what ports on each master cylinder do what. the problem we ran into with the geo MC is that it has 3 ports for lines. the toy MC has 2. what lines need to go where?

any help would be great!

thanks

2 of the ports should be for the individual front brakes and 1 for the rear. The toyota already has a splitter to accommodate the factory booster.