Does anyone know if the "Stock/OEM" 1970 B-body Brake distribution block is actually just a distribution block or is there any type of "proportioning" or connection between the front and rear brake lines/pressure?

The reason I ask is that I am preparing to install a line-lock/roll control and was hoping to install it on the line (for the front brakes) from the master cylinder before the distribution block.

Any thoughts/recommendations?

Thanks!