Distribution Block,72 Swinger

SO if i converted my 1969 Dart Swinger front drum brakes to factory front kelsey hayes discs ( Manual brakes )... What should i use BLK 250 AND hold off valve ... OR Distribution block AND hold off valve ???
It seems that 68/69 Darts with front discs had a 2 piece front to rear brake line ... SO there has to be to brass junctions needed ...