Once again:
The Mustang isn't a muscle car except for very specific versions, like the Super Cobra Jets and possibly GT500s.
says who? Who is they?
Muscle car is a term used to refer to a variety of high-performance automobiles.[1] The Merriam-Webster dictionary defines muscle cars as "any of a group of American-made 2-door sports coupes with powerful engines designed for high-performance driving."[2] A large V8 engine is fitted in a 2-door, rear wheel drive, family-style mid-size or full-size car designed for four or more passengers. Sold at an affordable price, muscle cars are intended for mainly street use and occasional drag racing.[3][4][5][6] They are distinct from two-seat sports cars and expensive 2+2 GTs intended for high-speed touring and road racing. Developed simultaneously in their own markets, muscle cars also emerged from manufacturers in Australia, South Africa, the United Kingdom, and elsewhere.
According to Muscle Cars, a book written by Peter Henshaw, a "muscle car" is "exactly what the name implies. It is a product of the American car industry adhering to the hot rodder's philosophy of taking a small car and putting a large-displacement engine in it. The Muscle Car is Charles Atlas kicking sand in the face of the 98 horsepower weakling."[7] Henshaw further asserts that the muscle car was designed for straight-line speed, and did not have the "sophisticated chassis", "engineering integrity", or "lithe appearance" of European high-performance cars.[7]
http://en.wikipedia.org/wiki/Muscle_car#DefinitionMotor Trend identified the following models as "musclecars" in 1965:
19621965 Dodge Dart / Plymouth Fury 413/426 Max Wedge/426 Hemi
19641965 Ford Thunderbolt 427
19651969 Buick Skylark Gran Sport
19651970 Dodge Coronet/Plymouth Belvedere 426-S
1965 Chevrolet Chevelle Malibu SS
19651967 Oldsmobile Cutlass 442
Road & Track identified the following models as "musclecars" in 1965:
19641965 Pontiac Tempest Le Mans/GTO
19651975 Buick Riviera Gran Sport
19651969 Buick Skylark Gran Sport
19651970 Dodge Coronet/Plymouth Belvedere 426-S
1965 Chevrolet Chevelle Malibu SS
19651967 Oldsmobile Cutlass 442
Car and Driver also created a list of the 10 Best muscle cars for its January 1990 issue. The magazine focused on the engines and included:
19661967 Plymouth/Dodge intermediates with 426 Hemi
19681969 Plymouth/Dodge intermediates with 426 Hemi
19701971 Plymouth/Dodge intermediates with 426 Hemi
19661967 Chevy II SS327
19661969 Chevrolet Chevelle SS396
19681969 Chevy II Nova SS396
1969 Ford Torino Cobra 428
1969 Plymouth Road Runner/Dodge Super Bee 440 Six Pack
1970 Chevrolet Chevelle SS454
1969 Pontiac GTO
19841987 Buick Grand National
19831987 Chevrolet Monte Carlo SS