Hy Guys, in theory you could indeed use all four ports on the master cylinder, you would just need to use the two primary ports for the front brakes, and the two secondary ports for the rear brakes. You would have to run more tubing, and add another rear flex line if you did do it that way, sounds like a lot of extra work to me. As to pluging the ports, you just need to use an inverted flare plug of the correct size, Weatherhead p/n 131X?, you may have to purchase port adapters to convert the ports to a standard size because the modern master cylinders have all kinds of different size tube nuts goin into them, hope that helps.
