Unless it's a really rare car to invest in I'd rather invest in some of the newer retro cars out right now. The new Camaro is hot. In 2011 they will come out with a new motor with more horsepower. I believe 500 of them. Grrrrr! Price tag is over $40,000, but if you hold to it for 5 years with minimal miles you can gain about $20,000 or more. They will be in limited supply.
Franco