If you want to save some money converting to disc brakes, here's how:
The disc brake conversion consists of a few basic components:
1. Rotors (70-77 camaro) ($20 ea @ FLAPS)
2. Calipers- standard GM metric calipers, ie 70-77 camaro) ($15 ea @ FLAPS)
3. Brackets- can be bought separately for $100 +/-, or fabbed at a metalworking shop.
4. Caliper bolts ($30 +/-)
5. Studs & tire nuts- standard ($30 +/-)
6. Flexible brake line - standard ($30 +/-)
Searching around you may be able to find a template for the brackets and then someone can cut them from flat stock for you at a metal working shop, or you can do it yourself. Some vendors sell just the brackets, I think Speedway motors sell just the bracket.
When you do the rotors, you should upgrade the bearings to more modern roller bearings. These bearings are a standard bearing you can get at any parts house if you know the part number. Maybe someone who has done the conversion or has pictures of the bearings before they put them on will post it. If no one helps out, you can figure out the correct roller bearings by measuring the OD of your spindles and the ID of the rotors and then spending some time at bearing house.
You should also upgrade to a dual master cylinder. There are of course kits to buy, or you can buy just the bracket and find the master cylinder, combination vavle and residual valves separately.
Also, you should check your king pins and replace them if they are too worn.
CPP sells a kit that includes, rotors, bearings, calipers, brackets, master cylinder, and proportioning valve for $375, which is probably less than $100 more than what you'd spend tracking all that stuff down yourself.