What Disc Brakes to Use

I got to vote for the stock Mopar disks. Granted I only have a slant in the front of my Dart, but stock 73 and up front disks stop it very well. I use the cheapest pads I can find. You can run the slightly bigger rotors from a Diplomat, you just need the caliper bracket and rotors, and 15" wheels. I like the stock stuff because you can buy parts for it anywhere, usually in stock at most auto stores.

A few things to check on your setup.

Are the rear wheel cylinders working?
WC pistons not frozen in the bores?
Are you getting good fluid flow when bleeding?
Rubber hoses can look fine on the outside but be shot inside.
Are any of your hard lines kinked or crushed?

Just a few things to check.

Good luck, sounds like it will be a fun ride once it is stopping well.

TopHat