I was going over my new wiring harness for my 70 that I plan to install, and noticed that I have a TCS relay connected to the original harness. My car was originally a 350/TH350 car, so can anyone tell me why I would have this relay installed? Since the car never had a TCS system at all it makes no sense to me why I would have one. Does everyone have one?

I plan to cut these wires out BTW. Totally useless.

GP

I believe that all 70 model Camaros had the TCS, but you sure don't need it. I'd just tuck the wires into a wire loom and forget they are there. Then if some day, you decide to add it, the wiring exists.
TCS simply kept the vacuum from getting to the distributor vacuum advance until you reached high gear. That was intended to decrease emissions.
Having full vacuum advance in all gears is good for the engine, and in theory, it should help power. In the real world, you can't tell the difference because if you accelerate slowly, you can't tell how much power the engine has. If you accelerate at full throttle where you feel the full power of the engine, the engine vacuum drops because the throttle plates are fully open, and you don't get vacuum advance to the distributor, if the TCS is in line or not.