Do your homework.
Thanks to all the auto-auction shows and the Internet, there's more information available about the classic-car market than ever before. "We live in the age of technology and there's all this available data," says Allen. "You can put a car model name and 'sold for' into any search engine, and you're going to pull up all these forums and articles that are written on these vehicles. You can get pretty in-depth and figure out if it's the car for you. To really compare your potential investment to other recent sales, you need to accurately assess condition. "I always put them in a one to four category," says Allen. "One is a perfect car, and to this day, I've never met a "one." Two is a very good car, three is a good car, and four to me is a fair-condition car." In other words, skip any car that's in less than "fair condition."