I found this link on the interwebz the other day. http://www.conceptcarz.com/view/racing.aspx

It is a thorough introduction to all of the most famous racing series and cars both past and present. I have never been very interested in vintage racing or the cars but after visiting the Oldtimers GP at the famous Nürburgring I have to admit being a little excited when seeing and hearing 800+ hp alcohol powered, hilborn injected CanAm cars or a 700 hp Porsche 935 squatting out of corners with a glowing turbocharger dangling out the back.

Sprint cars are just cool (1962 Meskowski Sprint Car). All nonsense with lots of hp. Mirrors or safety not allowed:
1962 Meskowski Sprint Car Image

1970 Ferrari 312 from the F1 days before Bernie and his wallet: 1967 Ferrari 312 F1 Image

The 1973 Porche 917/30. 5.4 liter V12, 1200 hp as raced in the Can-Am series:
1973 Porsche 917/30 Image

88 IROC Camaro. Optional color scheme...
1977 Chevrolet IROC Camaro Image