Wilwood Disc Brake Conversion or similar

[csfields]

I have had my truck done for about a year (1971 C10 short bed). Running stock master cylinder, proportioning valve, drums in the rear along with 2.5 inch CPP drop spindles and stock caliper set up in the front. I have 20 inch wheels and looking to fill the void in wheel space by adding larger rotors both front and rear and converting to disc all the way around. I am wanting to go with Wilwood for an entire setup but not sure what to get. I also looked at the big brake kit at CPP which is a lot cheaper. I have emailed both companies with questions and yet to got a response from either. Anyone done Wilwood or the CPP? Looking at what is needed or pros and cons of each.