Probably blasphemy around these parts, but I've always like '68 Chevelles.

 

either a 69 Roadrunner, ac cobra, or something like that

 

Firebird.

 

That's a moving target for me. The Mustang is of course #1, but if there were no mustangs I have a list of about a dozen I would like. Right at this moment I think either a 1962-1967 Chevy II (Nova), or a 1960-63 Falcon woud top the list.

 

28 model A pickup

 

Probably a 1969 Charger.

 

Probably a 67 fairlane. Second would be a 64 falcon and third a 71 torino.
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67 Camaro z28

sorry, but its my favorite coupe.

 

If mustangs didn't exist I'm sure a lot of the muscle cars, and more specifically the pony cars, would not even exist because the mustang inspired many car companies to make competing cars.

but if all things were unaffected I'd probably take a 69 charger as well like someone before said

 

427 shelby cobra, or the mercury couger though thats alot like a mustang, maybe a plymouth cuda