Yes!!! I absolutely second what Jok and Dave said. By condensing the Pro show, the boredom factor drops, and many paying spectators may come early to take in some wheelstanding stock & super stock action prior to the main event. Look at circle tracks and how they run their shows...same philosophy.
Right before the show the announcers could even hype up and build some drama for Stock and Super Stock...that's what will draw fans. Between rounds at those SoCal 64 funny car events during the 70s they'd get a handful of bracket cars and pair them up by make...Chevy vs. Ford, Mopar vs. Chevy etc. for grudge matches. When the cars were staging the track announcer would stir up the spectators by screaming "how many want to see the Ford win? How about the Chevy?" and so on. It didn't matter if it was shoe polish or heads up racing... The win light would come on and the fans went wild...sometimes more than the funny car action. Rich Christensen's success can be attributed to similar tactics - always making cars the stars.