The best Musclecar year was....

[supergonzo]

Mike, I think if your a Pontiac fan it has to be 1964-1966

No big block chevy's (actually a small amount of them)
No Lighter Camaro's or Firebird's
Olds & Buick had nothing much and nobody bought them anyway
289 Mustangs's.........please
Butt Ugly Mopar's most with 273 cubes, some rare ugly mopar race cars

And over 215,000 GTO's were sold by 1966!!
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But otherwise I think most of the GM Cars & Mustangs peaked around 1969
Mopar finally got good styling by 1970
Buick finally built a screamer in 1970
1970 Chevy LS6 454 comes out, unfortunately the Chevelle weighs 3900 lbs now.