The special Pontiac's that do it for me:
Firebirds:
1969 Trans Am, 4 speed Ram Air IV. Would be really really neat with the prototype 303 Tunnel Port.
1973 SD 455, 4 speed.
1979 400, 4 speed. Not with the 'disco' hood flaming chicken.
1989 Turbo T/A 3.8L
Honestly, never really cared for the 'Disco' Birds from 1974-1978 aka 'Bandit' era.
GTO:
All years. Really like the iconic '66-'67, and '70 Judge.
1962 Catalina, SD 421.
Grand Prix:
1990-1996 (2 door) Turbo, SE, GT, and GTP models.