I have used rear rotors from a IROC a pair of $12 caliper brackets 2 reman 78-9 G body GM calipers for the front & matching hoses I had to have .100 machined off the outer flange of the axles to fit inside the rotors it costs around $200-250 new parts & labor even less if you own a welder

I have done them with all Speedway motors parts that the Circle boys use
My next one I'm doing I'm going to use the clamp on bracket You can do the total trick look calipers & all for $300 or so pick your own offset on the rotors 12" brakes can be done for a little over the $300
Thats with vented rotors that won't squeak like the the solid ones do on the street