It's a 1972 Firebird Esprit that originally came equiped with a Pontiac 350 2bb with single exhaust. It's kind of hard to tell from the pics, but if it has t-tops, the value would be hurt quite a bit, at least in the purist circles. The Firebirds didn't get t-tops until 1976-and that was on the Trans Am. In 1977 any Firebird could be ordered with t-tops.