NHRA's Junior Stock of the 1960s is one of my favorite drag racing classes of all time because, from what I've read and seen in books and online, it seems like it would've been a blast to do.
I read somewhere that the Funny Car drivers of the time were the cool-guy, leather-jacketed speed seekers; whereas the Junior Stockers were typically the guys that paid attention in school and were more inventive..in other words, the nerds. So you have these car nerds building these heavy cars to run heads-up, coming up with all sorts of way to make a stock car faster. There were rules, but the Junior Stockers found many loop holes and ways to make the cars operate in the grey areas of those rules with all sorts clever ways. If you want to read about this historical class, check out "Junior Stock: Racing the family sedan" by Doug Boyce on Amazon.com.