The Corvette Stingray does fall into that category, but not always. Bleh, you know how you have those crazy lettering systems for engines, American Engines were always and by car guys are still measured in cubic inches, not liters. In 1968 there were at least 7 engines available for the camaro. The only difference in the camaro the front grill, the hood, and the badges. Some 1968 Camaros are 6 cylinders just like the original 1964 1/2 Mustang. (The Camaro came out in 1967, the firebird in 196

At the time camaros and firebirds had completely different engines, chevy had the most popular big block which was the two versions of the 396 bbc.(big block Chevy) One was a high out put motor producing 375hp and it was underrated. The second 325hp. again underrated due to insurance prices on the rise in the 60's. This engine revved to 6500 rpm if i remeber correctly, while pontaics got the legendary 402BBP. Though some got the crappy 400sb. Other engines included the Race driven Chevrolet 302, the 327, the 350, the 396, the 396H.O. and the Corvette Stingray 427bbc, producing 475hp from the factory in 1967 which was later rated at a lower rpm and rated @ 425hp. The little tiny 302 which was the orignal Z-28 motor which ford copied(slightly different bore and stroke) to get into the Trans America Racing Series; was rated @ 190hp. it has well over 400hp @ over 7,000rpms. What did the RX-7 boast @ those times, it doesn't have to be an american car just be from that era. Because bleh a 350 isn't a muscle car its a grocery getter, and the 305 is a bored and stroked 262 original used in chevy trucks and the monza/ vega.
As far as when the muscle car era died, it was pretty much died by 73, i believe that is when the last big block rolled off the line, the 302 died in 1969. When The Trans Am series lifted its cubic inch limit from 305cid max to 350. And that has pretty much evolved into Nascar.
As of the 2005 model year yes it is just another pretty corvette with an LS2 engine. 400hp 400tq out of a 346cid engine. This July the corvettes will and i repeat will be competing with and destroying the viper. The Newer vette makes 505hp 470 ft lbs. of torque, it's top speed is well over 200mph the engines are hand built aluminum blocks with mostly titanium parts, the body is aluminum, and it weighs around 3200lbs.
Sorry about the long post.