As I am sure you have found there are lots of kits out there, unfortunately many of them are not all that good. Wilwood has a name for quality but I have to be honest that they do not cater to older vehicles very well. Sure you can get some of their stuff, Stop Tech, etc. but it is not going to be "bolt on".
So you have to determine what you want; sexy name brand stuff or bolt on functional stuff. Not saying that the sexy stuff isn't functional, what i am saying is that you will spend more and do more work to get it functional. If you want true bolt on stuff, look at Dr Diff's site, he knows Mopar. Also I have heard some decent things about Scarebird.
You need to understand the braking system in order to get what is needed to make the car stop correctly. The operative word here is "system", it is comprised of the brake pedal (ratio), booster (assuming power brakes), master cylinder, metering valve, proportioning valve, brake lines, calipers, pads, rotors and tires. Every one of these things affects how a car stops and they all have to work in sync to make it perform correctly.
Everyone wants some bolt on "kit" and call it done, sometimes you get lucky but more times than not you don't. 4 wheel discs require different equipment than drums or drum/disc and modern performance calipers require different line pressure than older systems.
You have several options;
1. buy a random kit, put it on the car and hope it works
2. research the brake system and gain an in-depth understanding of what you need and then buy the right stuff
3. buy a kit from someone who specializes in Mopar stuff and get brakes that work
Having said all of that (and having done a number of 4 wheel disc brake conversions); for a street driven car especially a classic car rear drums will perform very well especially with some of the modern shoes that are now available. I know they are not as sexy as 4WD systems but they work. Go on any forum and type "4 wheel disc" (or something like that) and read the horror stories along with the people who say theirs "works" but never really say how much they drive the car.
Give Cass at Dr Diff a call and he will tell you more than you want to know about brakes.
