Disc Brake Conversion for a 68 Charger

I know this has been asked probably a few times before, but who has the best and cheapest conversion kit non power would be fine, i was looking for either kit the one that bolts onto the existing spindle or the one that replaces the spindles.

This is not a kit but is probably the cheapest...

http://www.moparaction.com/tech/archive/disc-main.html

My car has late model A-body disc's w/ a manual master cylinder and a Summit adjustable PV. That's about as cheap as it gets. They work pretty well too.