If I remember correctly, on my 53 Chev. 3100 the new master cylinder was set up to be plumbed out of either side. Left front brake came out of the left[drivers] side of MC, right front brake out of the right side of MC, and rear out of right side. Section of MC with largest reservoir went to front brakes. Plug in other port.
LMC has "fittings" and "adaptors"
http://www.lmctruck.com/icatalog/ca/full.aspx?Page=94
