1970 L/78 Nova brake valve setup question

[L78steve]

There was never a block on the frame.The original line is still there but thats it all else is gone.I have a good reference picture that shows the brass Texas shaped valve mounted to the right (pass side) of the master.And the pic.also shows a brass distribution block with 3 segments.What I mean by 3 segments is the forward junction for front lines,Then the balance switch then a junction for the line from the Texas valve to the rear brake line.And lastly a junction at the rear of the block that accepts the line from the rear port of the master to the Texas valve.Is this set-up common on the late 70 novas?