ECI brakes

[79 Camaro]

I'm looking at a ECI brake kit for my new Nova project. Mustang II front and Ford 9" rear.

They use a C4 13" rotor and a GM truck calipers. They said they will work better than C5 stuff when used with their Caddy rear calipers. Said the truck calipers have one big ID piston compared to the two smaller pistons in the C5calipers. More PSI with the truck calipers and they said a better setup with a manual master cylinder.

Not nearly as cool as a C5 setup but wondering what the brake gurus think.

Any thoughts?