318 build up

Talked to a guy at the track today that had a built 318 in a duster, he was running mid 7's in the 1/8 with it. He said that he had sonic checked the block and bored it all it would take, was running the aeroheads with 1.88 valves ported but with the stock valve springs that came with the heads. Had 5:11 gears and was turning it around 6K in the lights. Was going to upgrade the springs soon but didn't want to turn it too high as he was afraid reliability would suffer. (of course you never know for sure what it was with those drag racers, I've heard that they sometimes lie about their combination's)