[TheJDMan]

I noticed in the pics that the Chevelle still has the stock rear wheel openings which reminded me of the following.

One story I read was that back in the day NASCAR allowed the teams to trim the rear fender wheel openings for tire clearance in order to be able to change tires. Smokey shows up at the track with the Chevelle and his stock rear quarter fenders are low covering the tires giving him an obvious aero advantage but all the other teams are laughing and wondering how he's going to change tires. So he goes out in qualifying and turns the fastest lap. Once qualifying ends he goes back to the pits and trims the fenders to clear the tires. When the other teams complained he simply pointed out that the rules allowed him to trim the fenders, but the rules didn't say anything about when he was allowed to trim them.