Check out
www.discbrakeswap.com. I just ordered one of those kits for my 67fb. Price is good, the kit comes with everything you need (minus hard brake lines), and I've heard support is excellent. Degins (I believe the guy that runs the business) posts here every now and then. In fact, he posted a couple days ago concerning a discussion about disc brake conversions.
If you've got larger wheels in mind and want to spend some money on abigger brake kit, there are kits available that use 13" rotors. I believe Mustang Steve's website (
www.mustangsteve.com) has that kit.