Here are the movie posters of the Bandit films from those days,
http://www.sd455.com/moviesmokeybandit.htm
Road & Track tested a 220 bhp W72 Trans Am in 1978 and got 0-60 in 6.5, the BMW 633 CSi of the time did about 8.2 seconds and so did the V12 Jag XJS. But the Trans Am cost under $10,000 [80?] , but the other two cost over 20K.
I think they played with the HP ratings in those times so as not to show up the Corvette whose optional L82 5.7 at the time was pretty anemic.
The turbo 4.9 made 210 bhp & 4,000 rpm , 345 lbs/ft & 2000 rpm, but it was automatic only.
I should add for youngsters that all cars in those years had 91 octane unleaded as the best gas, and 91 in those days was lower in quality than 91 today because they have changed the octane ratings.
A sizeable portion of Firebird / Trans Am owners are female.
Nice.