I don’t really remember what the rules were back then for TA other than minimum homologation of like 1000 chassis or something, and I think that they had to run the engine that the car came with from the factory at that time. I don’t think the 20V came in the 200 until '89, could be wrong though???
I watched more Can Am than Trans Am. TA was mostly just old shit v8 cars that didn’t interest me. That 200 was the first AWD vehicle to run in the series.