GtoRa2, I never said my 409 was the ****e, I just said it was a muscle car. IMO, a muscle car is any car that's a typical daily driver that has an option for a big motor with lots of horsepower. {i.e. A Tempest with the big motor became the GTO. The Camero and Mustangs were Pony cars, but had the option of a fast motor. The "full sized" Chevys came with any engine from a six to a 409(396, 427 & 454 in later years)}. Here's a list compiled by a site devoted to muscle cars. It looks like the 67 GTO made it to number 47 on the list of the 50 fastest muscle cars.
50 FASTEST MUSCLECARS
# YEAR/MODEL ET/MPH ENGINE HP TRANS GEAR SOURCE
1 1966 427 Cobra 12.20@118 427 8V 425 4-Speed 3.54 CC 11/65
2 1966 Corvette 427 12.8@112 L72 427 425 4-Speed 3.36 CD 11/65
3 1969 Road Runner 12.91@111.8 440 Six BBL 390 4-Speed 4.10 SS 6/69
4 1970 Hemi Cuda 13.10@107.12 426 Hemi 425 4-Speed 3.54 CC 11/69
5 1970 Chevelle SS454 13.12@107.01 454 LS6 450 4-Speed 3.55 CC 11/69
6 1969 Camaro 13.16@110.21 427 ZL1 430 4-Speed 4.10 HC 6/69
7 1968 Corvette 13.30@108 427 6V 435 4-Speed 3.70 HC 5/68
8 1970 Road Runner 13.34@107.5 426 Hemi 425 automatic 4.10 SS 12/69
9 1970 Buick GS Stage I 13.38@105.5 455 Stage I 360 automatic 3.64 MT 1/70
10 1968 Corvette 427 13.41@109.5 L72 427 425 4-Speed 3.55 CD 6/68
11 1969 Charger 500 13.48@109 426 Hemi 425 4-Speed 4.10 HR 2/69
12 1968 Charger 13.50@105 426 Hemi 425 automatic 3.23 CD 11/67
12 1970 Plymouth Superbird 13.50@105 426 Hemi 425 ? ? ?
14 1968 Road Runner 13.54@105.1 426 Hemi 425 automatic 3.55 CD 1/69
15 1973 Trans Am 13.54@104.29 455 SD 310 automatic 3.42 HR 6/73
16 1969 Corvette 13.56@111.1 427 L88 430 automatic 3.36 HR 4/69
17 1969 Super Bee 13.56@105.6 440 Six Pack 390 automatic 4.10 HR 8/69
18 1969 Boss 429 Mustang 13.60@106 Boss 429 375 4-Speed 3.91 HC 9/69
19 1970 Challenger R/T 13.62@104.3 440 Six Pack 390 automatic 3.23 CC 11/69
20 1970 Torino Cobra 13.63@105.9 429 SCJ 370 automatic 3.91 SS 3/70
21 1968 Biscayne 13.65@105 427 L72 425 4-Speed 4.56 SS 4/68
22 1964 Polara 500 13.70@107.37 426 4V 365 4-Speed 3.23 HC 2/64
23 1969 GTX 13.70@102.8 440 4V 375 automatic 4.10 MT 1/69
24 1969 Dart 440 13.71@105 440 4V 375 automatic 3.55 CC 5/69
25 1971 Road Runner 13.71@101.2 440 Six BBL 390 automatic 4.10 CC 1/71
26 1971 Cuda 13.72@106 440 Six BBL 390 automatic 4.10 SS 4/71
27 1971 Corvette 13.72@102.04 454 LS6 450 4-Speed 3.36 CL 8/71
28 1971 Super Bee 13.73@104 426 Hemi 425 automatic 4.10 MT 12/70
29 1968 Hurst/Olds 13.77@103.91 455 W-30 390 automatic 3.91 SS 8/68
30 1970 Hemi 'Cuda 13.78@101.2 426 Hemi 425 automatic 4.10 MT 9/69
31 1968 Firebird 13.79@106 400 HO 335 4-Speed N/A HR 3/68
32 1967 Corvette 13.80@108 427 6V 435 4-Speed 3.55 HR 5/67
33 1965 Catalina 13.80@106 421 6V ? 4-Speed 3.42 CD 3/65
34 1969 Super Bee Six Pack 13.80@104.2 440 Six BBL 390 automatic 4.10 CD 7/69
35 1971 Boss 351 Mustang 13.80@104 Boss 351 330 4-Speed 3.91 MT 1/71
36 1966 Satellite 13.81@104 426 Hemi 425 4-Speed 3.54 CD 4/66
37 1969 Coronet R/T 13.83@102.27 440 4V 375 4-Speed 4.10 SS 4/69
38 1968 Cyclone GT 13.86@101.69 428 CJ 335 automatic 4.11 MT 8/68
39 1969 Nova SS 396 13.87@105.1 396 4V 375 automatic 3.55 HR 7/69
40 1969 Shelby GT-500 13.87@104.52 428 CJ 335 4-Speed 3.91 SS 9/69
41 1969 Cyclone Cobra Jet 13.88@101.7 428 CJ 335 automatic 4.11 MT 1/69
42 1970 Olds 4-4-2 W-30 13.88@95.84 455 W-30 370 automatic 3.42 CC 11/69
43 1962 Corvette 13.89@105.14 327 FI 360 4-Speed 4.10 HR 1/62
44 1969 Barracuda 13.89@103.21 440 4V 375 automatic 4.10 SS 8/69
45 1962 Catalina 13.90@107 421 4V ? 4-Speed 4.30 MT 5/62
46 1969 Mustang Mach I 13.90@103.32 428 CJ 335 automatic 3.50 CL 3/69
47 1967 GTO 13.90@102.8 400 RA 360 automatic 4.33 CL 10/67
48 1970 Trans Am 13.90@102 400 RA 345 4-Speed 3.91 HR 2/70
49 1970 Torino Cobra 13.99@101 429 4V ? 4-Speed 3.91 MT 2/70
Legend: CC=Car Craft, CD=Car and Driver, CL=Car Life, HC=Hi Performance Cars, HR=Hot Rod, MCR=Muscle Car Review, MM=Mopar Muscle, MT=Motor Trend, SS=Super Stock
Yes, I noticed that there are no 409s on the list, but it does show you the range of cars that are considered muscle cars from pony cars, to mid-size to full size. Get over "who coined the phrase" muscle car and see that your "narrow" description has a "narrow" fan base.
Daddy luvs ya!