I believe that the TCS system was only on the 'base' engines which did not get an A.I.R. pump. But, I could be mistaken on that. The TCS system was there ONLY for EPA emissions purpose. It did NOTHING for the engine, for economy, or for performance.
Basically, it retarded timing when the transmission (either manual or auto) was in lower ranges, but dropped out if the engine was either too hot or too cold and/or if WOT was employed. A retarded engine will run hotter in the combustion chamber and burn off more of the residual hydrocarbons.
Unless you just want to put your engine back into "factory-new condition" for shows or judging, save your time and money and leave it off the engine.https://www.corvetteforum.com/forums/c3-tech-performance/3789759-what-is-transmission-temperature-controlled-spark-tcs.html