Best-hard to say after owning about four hundred cars.
Some stand outs-68 Ferrari 330 GTC, 73 911S, Lamborghini 400GT,69 427 Corvette,70 Challenger
Worst-Lexus LS400-simply an awful barge that I couldn't wait to unload-not very reliable either.
Current favorites:67 Corvette-has no difficulty running with my friends and their hot rodded 911s. And, of course, my 67 911.