[G&R's57GMC]

The size of the reservoir is matched to the calipers.
The Camero's single piston caliper is much smaller then the Vette's
dual piston caliper.
As the pads wear the fluid level drops in the reservoir to compensate for the piston (s) extending to make up for the pad wear.

With the small reservoir you have you will have to keep adding fluid as the pads wear or you will loose the rear brakes and have to refill and bleed the rear system.
The other problem is when its time to replace the pads, As the pistons are pushed back it will overfill the reservoir and spray fluid out of the master. To avoid this open the bleeders as you push back the piston.

Of course by the time that happens you'll have forgotten all this and have fluid everywhere

Probably just better to go with the correct parts