Hmmmm…
Tough to narrow down to only 4.
1966 Pontiac GTO Hardtop - 389, 3x2, 4speed - seriously this is a dream car for me that I finally own
1969 Pontiac Trans Am - Ram Air IV, 4 speed
1968/69/70 Dodge Charger - 440 6bbl w/Pistol Grip 4speed & a Dana 60
1964 Ford Fairlane Thunderbolt - Not really a Musclecar, but a custom built factory Super Stock car
1967 Chevelle SS396 w/4speed
1965 Olds F85/442 Hardtop
1970 Olds 442 W30
1968 Plymouth Road Runner w/Hemi, 4spd, & Dana 60
How about some non-musclecars:
1959 Chevy Impala Hardtop 348+3x2+4speed
1962 Pontiac Grand Prix 421 & 3x2 or even a Catalina SD Lightweight
1966 Pontiac Catalina 2+2 Convt. w/421, 3x2, & 4speed
1959 Pontiac Bonneville Convertibile
1969 Chrysler 300 Convertible
1970 Plymouth Fury GT Hardtop
1965 Pontiac Grand Prix
Bob Johnson’s Hemi 'Cuda: I saw it in person & on a track. One of the baddest HotRods ever built.