I'd own one, but no '49 Olds was a muscle car
Maybe the oldest forerunner, sure. But a fullsize car? The general definition of muscle car is intermediate car that could have the largest factory installed engine, not any car that had an identity due to a powerful engine
if the '49 Olds is a muslce car, then in 1938 Ford began the whole thing with the 24 stud flathead V8 and a 1940 Ford is a muscle car too...but I'm not of that opinion
I dig forgotten factory performance as much as the next guy, but the muscle car arena was built in the mid to late 50s, by Ford, with factory dual quad and factory supercharged Vickies. And I wouldn't call them true muscle cars either...becasue the cars that made the term come to be hadn't been built yet!
Muscle cars were also about rebellious youth and general disregard for puffed up authority, and that was solidly a '60s and early '70s thing. James Dean may have been associated with something like that, but it doesn't make a Porsche 550a a muslce car, does it?