If you are looking for a return on a $10k investment put a down payment on a house. Cars are mostly not good investments. You can see all the muscle cars on Barrett-Jackson that you want to but if a person had invested the original price in the stockmarket (or better yet Palo Alto, Ca real estate) they would have been money ahead.

Granted there have been big bucks lost in the market but on average over the long term the market returns about 11% per year. The rule of 72 means that if you average 11% a year you will double your money in 6.5 years. Divide that into 35 years, say from 1971 till 2006, and you get about 5.4 doublings of your money. Say you paid $4k for the car new. That comes out to about $180k. Now there are obviously tax liabilities on this but then consider what it would have cost you to maintain you car for 35 years. Insurance, storage, maintenance, restoration, etc.

Investing in the market is certainly not as much fun as driving faround in a really cool car but if it is return on your money that you want stay away from cars and jewelry.