I don’t know. It appears that there were quite a few Muscle cars mentioned through out this thread.
I don’t know how everyone else feels about the American muscle cars, but I find them over kill for the majority of events that they can enter.
(Well at least in the events that are restricted by year that a car is manufactured in.) Kind of like taking a hand gun into a water gun fight.
The majority of the starting line ups in the “classic” events include cars that will have their doors blown off by even the lowest powered muscle car.
That’s not to say that I don’t own any or enjoy driving them. I think I have at least 4 in my garage, and I have used them in various events.
But given the choice between a Shelby GT350 and a Nissan Skyline GT-B to compete in something like the “1000 Miles” event, I would take the Skyline.
It’s more inline with what the A.I will be driving making the race closer and over all more exciting.
I guess it just comes down to how much of a challenge you want to give your self.
Agreed. The muscle cars are also the worst in wear (tires, and, in real life, sometimes engines and brakes), making them not very endurance-race friendly.
Continuing wth the debate between mafia_boy and nd 4 holden spd, I chose Japanese cars because their build also reflects the difference between them and America on starting out in the automobile industry in the Sixties: Coming off the deep patriotism felt by the Americans, they exuded an air of confidence never seen before. There, the fuel was cheap, and the average American had plenty of money for the time, thus economy outburst = decadent cars. The drag race mindset also placed less priority on handling, so the makers could get away with soggy suspensions and weak drum brakes, as long as the car flew straight on the strip. These soft affairs did nothing for cornering.
The Japanese cars, however, were built to last and save fuel. The economy was still recovering and getting on its feet in the wake of the massive growth during the Second World War. Due to less material (in some cases), the cars were lighter and the [most-likely] same soft brakes could stop the car more efficiently. Fuel economy was paramount as well, so, being purpose-built, the cars succeeded. Reluctance to import the vehicles most likely came from the isolation mindset of the Japanese, tensions since the Second World War, and the tastes of the Americans then.
However, that said, the American cars were very likely more well-finished than the Japanese vehicles, and they tended to sound better, from a modern standpoint. Japanese classics are also fewer and far between than American classics because the Japanese also built more lacklustre vehicles for daily use, the first supercar from the country being the Toyota 2000GT. In the meantime, American cars were flashy and very flamboyant, and they were based on performance, unlike many Japanese vehicles of the time.
In GT4, all that changes because the racing is done on an international level, though no drag-racing exists. In that case, both Japanese and American classic vehicles of the A.I. (Cobra and Corvette aside) are often chasing the European machinery, the greater American muscle-cars pushed aside to introduce a greater palette of Sixties sports machinery. And no American car is truly a pleasure to drive in light of the shortage of high-powered European racers, and for their inclination to have awful handling.
So, seeing all that, I was inclined to select a Japanese classic, but on a more international level...
Japanese classics: Nissan Skyline Sport Coupe BLRA-3 1962
-Nissan Fairlady SR311 1968
-Toyota 2000GT 1967
American classics: Chevrolet Corvette C2 Z06 Race Car 1963
-Plymouth Superbird/Dodge Charger Daytona
European classic-
Germany: BMW 2002 Turbo
-Mercedes 300SL Coupe
Britain: Ginetta G4
-Jaguar E-Type 1965
Italy: Alfa Romeo Giulia Sprint Speciale 1963
-Alfa Romeo Giulia Sprint GTA 1600 1965
-Lancia Stratos 1973
France:Citroen 2CV
-Alpine A110S 1973
Would you like to know more? PM me and we'll talk as we want to keep this thread on topic.
Send the GTO out on Special Conditions on Swiss Alps and have some fun and have it act like the General Lee did!! 
I've driven the GTO many times before, it's a slug compared to most of the other early 70's JDM cars. 
