First of all, welcome to the Mopar addiction, I mean Hobby. Let me first ask what your plans are. As has already been said, there is nothing at all wrong with drums at all 4 corners for starters. If you plan to stay stock (or close to it), then all drums is fine. After all, most of the Mopars during the muscle car craze had them. If you plan to bump up horsepower very much, then safety will dictate that an equal eye on stopping power is needed.
OR, even with a completely stock car, disks are a very nice upgrade. They will provide better braking and, therefore, more safety. Ultimately the choice is yours. I would lean towards the upgrade regardless. I upgraded my 69 Barracuda about 15 years ago, and I think it was one of the best upgrades I ever made.
@RustyRatRod gives good advice on using factory parts. If you want to go with all new stuff, there are LOTS of choices. Wilwood is really good, but they are a bit pricey. And I would definitely go with 4.5" pattern. Wheel choices are much better that way.
