70 GTO Line Lock location
 

70 GTO. Disc/Drum stock type system. Has the front brake line coming out of the master cylinder to the small disc hold off valve that hangs on the master then to the firewall distribution block. Rear brake line goes from master directly to the distribution block on the firewall.

Did you put the line lock for the front brakes between the master and the hold off or between the hold off and the firewall distribution block? Does it matter?

I would do it after the holdoff valve. It would be easier to mount and plumb it that way.