Here are a couple of race cars from the same event.
Sweet 67 Chevy II that ran mid 10's with a 383 and an NOS plate system.
A 67 Chevy II SS with a 440 that was running high 9's without the NOS system. It was a fresh engine and he hadn't sprayed it yet, but was expecting 8's on the bottle.
Nice 71 Chevelle SS with a big block and NOS. Since this car didn't have a roll bar he was only allowed to run 11.50's or slower so he kept shutting it down early. Finally at the end of the day he ran it out the back door with a mid 10 second pass.