67 Dart Disc Conversion brake hose too short

I was under the impression that it was a bad idea to move the caliper to the back. The reasoning I have always heard was that it was designed to be towards the front for a reason. I only ask because I am getting ready to start this swap onto my '65 Barracuda along with adding a front sway bar. Everything was ordered from PST. It will help to know ahead of time before I but the brake hoses.
I am starting to buy a few things each week until I have all the parts ready. When I bought the disc brake caliper hardware kit, the "metal plates" are a touch wider than the originals that were rusted to the calipers, is that just an aftermarket difference? Has anyone else noticed it? Thanks for any info.