Disc brake conversion (70 Dart)

Hi all,

I'm looking to upgrade from my stock 9" drum brakes to disc. I got the brake related parts shown in the pics below (including the four wider rims) from the Dart's previous owner. Not sure if these are worth saving and reusing or just as cores etc but would love any input or advice on where best to start looking for the rest needed to upgrade my brakes (I plan to leave the rear drums for now until I swap out the rear end from the stock slant six 7&1/4). I've come across a few brake sellers but am not familiar enough to have a good feel of where to look or what might look like a good deal but isn't worth the time/aggravation etc.

Thanks for your help as always!