Although I didn't race the Trans-Am series I did attend quite a few races in 1970. I had just moved up to a F/P Triumph Spitfire from a H/P Bugeye Sprite. This was the high water mark for the Trans-Am racers and many of the names continued well into the '70's and 80's. Mark Donahue, Peter Revson, Jim Hall (Of Chaparral fame), Dan Gurney, Sam Posey and even Steve McQueen had a run at it.
AMC Javelins did surprisingly well while competing with the Mustangs, Camaros and such. We made a trek to Mid-Ohio to watch one race but I forget who was there.
I was more of a sports car oriented kind of guy. Bugeye Sprites, Spitfires, TR-5 then a 2.4 Liter 911. The 911 is the car that I later took to IMSA. Because of some tired assed rules the 240Z Datsuns did a number on the Porsches. I raced against Paul Newman when he was drivng for Bob Sharp Datsun. He had all the money and didn't care how "dirty" he had to play to win.
I really enjoyed the Trans-Am cars but for pure noise and excitement the Can-Am cars were hard to beat. Now THEY made some noise and showed a lot of innovation. See Chaparral cars again.