Pontiac Trans Am or Firebird

Good day. I was thinking if I should not increase a Pontiac Firebird of the 3rd generation(!!). The digners are so cheap from the purchase price (of course at the year ’82 to ’90) only would interest me, how high the performance of the things is, how much they consume etc. Especially because of the automatic, there is not an extreme loss of performance? Is it worth buying a car like this at all, or is it quite vulnerable? Many questions, I thank I’m already ready for the Antworeten