66 Valiant Dual Master Conversion

I just recently went through this same problem on my 64 Valiant. It was a bit of a fiasco on their part. From what I was told, the master cylinder lines design weren't completed at the distribution block end. They had me bend coat hanger templates for the lines I needed remade, sent them and a bunch of pics and they bent new ones for me. I modified the front lines to meet up with the distribution block myself. Rear line was perfect. I ended up welding frame connectors in, which interfered with the rear line and had to move the distribution block for possible header clearance so, I decided to bend copper lines instead.
They have quality stuff and it looked great. Customer service wasn't great. In fact, one rep I spoke to told me I just need to use the original distribution block!
I ended up dealing with Chuck, he was the sales manager. He ended up quitting during all this and nobody knew my replacement parts were done and ready to be shipped. Eventually I got all the lines I needed, but it was a little difficult getting there.
I would call and let them know the problems you're having.