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i would be suprised if anyone did make a kit,it would have to be very expensive and difficult to install. a mechanical and electrical nightmare to be sure.
In the OLD days when ABS first came out, there were aftermarket "ABS add-ons" offered. These simply plumbed into the brake line and worked by "feeling" the minute pulses in the wheels that would normally occur at the advent of lock-up, and using a "gas-filled chamber" (or such), would release a bit of pressure keeping the wheels from locking.
I can't imagine that they worked all that well because they never caught on, and did change the feel of the pedal a bit due to the compression of the gas. Maybe you could find one cheap and give it a shot.
My first car, 85 Firebird, did not have ABS. What I did was use a FF rated brake pad that does not grab as well when cold but only when hot. Most street pads are EE rated and grab very well when cold and lock up easy when it gets hotter.
Downside to performance FF rated pads are they can make the pedal a little softer when cold.
Performance friction carbon Met is what I like, but there are other pads similar.
If you don't drive the car is rain, snow, sleet or in heavy traffic...why would you need ABS? Besides, it's damn difficult to get a C3 to go into a slide, anyway. I have been in a "panic" stop or two over the years, and never felt I needed the ABS, yet.
The difficult part is getting the reluctor wheels mounted (properly) onto the axles/spindles/rotors and getting the sensor mounted the proper distance away from those wheels. If you get that done, then it's just a matter of installing the salvaged ABS system (later model Corvette unit should fit the bill) into your car, running the required brake lines and sensor wiring to each wheel, installing the ABS computer and trying it out. Of course, you don't have a computer or an ABS warning light on your dashboard to know if it's working properly or not. Hmmmm... Sound like a PITA job to me.