I think you would do better with C4 Corvette suspension & components, as the C4 has a shorter w/b and trans bolted to the eng. There just may not be enough room for the C5 components. Good luck.
C4' have been done, the c5 has only been done in a funny strech project that looks like a convertible corvette with cobra fenders, its just plan bad. take a look at the other forum to see the c5 chassis, it takes some mods but it fits. and its better for the rear.
Center of tread to center of tread is tread width or track. Flange to flange is another measurement that only equals tread width when the wheels have zero offset.