Thanks for the info guys. What I've got is a 82 C3 that I have already modified. The car was actually given to me about 6 years ago. It had been sitting in a warehouse for 10 years and didn't run and was in pretty bad shape. So I took it. Motor is now a 383 balanced and blueprinted with true roller cam, Dicky Scoggens intake, high flow runners, larger plenum, 26 lb injectors, MSD ignition, high flow 210 cc aluminum vortec heads and a Ez-Fast injection harness and computer and installed a 700R4 Monster trans with 2800 stall.
I only wanted a strong daily driver. I completely redid the interior except for the dash. That's on the list too. I put stainless side mount headers and 17x9.5 Z06 rims front and back.
The plan now is to upgrade the brakes. Probably going to go 18x10.5 rear this winter with offset trailing arms. If that is required to get those tires under there. Going to lower the front and rear with new suspension. I figure this old girl is old and tired and so are all the rubber parts.
I will probably go with the 14" rotors and the 2012 Z06 front calipers. They should clear on 17" rims, if not Il go with the 13" rotors. The rears I think on the 2012 are 4 piston but bigger than the 82 C3's. From what I can gather the stock C3 uses the same caliper front and back. This is the whole reason that I was going to go with 6 piston all around. I could even put the 14" rotors out back.
After this procedure I'll be upgrading the front and rear bumpers to fiberglass. A Dayton front spoiler and a modified rear that has a little taller rear spoiler. Then top it off with a L88 hood and fresh paint.