Early A dual master recommendation?

Thank you! I read from an article at earlycuda.org that you can use the original distribution block, just block one outlet and run an entirely new line from the master directly to the rear brakes. But apparently with this 67-72 metering block I can use the existing line from the block to the rear brakes and only need new lines from the master to the block?
I wouldn't do it that way especially if you are trying to get it to be inspected by a system that does not tolerate any alterations.USE THE CORRECT STUFF FOR A 67 and you will have no problems with the inspector. It will look and act correct