So you're staying with 4 drum brake? I take it all you want to do is add a booster to your 4 drum brakes. If that's the case, all you need is the booster; and to route the lines with the original MC forward. Be careful not to crimp the lines!

I did the booster upgrade to my cammer. The only items I needed were the shorter push rod, and a threaded hose barb (intake manifold) for the vac line.

The shorter push rod is 1.5 inches long... I think. Let me check for the old thread I started about this subject. If you can't find one, cut the one you have and round off the tip so it seats correctly. Also you have to move the clevis on the brake pedal to the lower hole if I'm not mistaken.