Last year we ran a 340 Duster with 28" tall slicks & a 4:56 gear. Had a best 60' @ 1.68, 1/8 mile 7.71 @ 90.98 mph, 1/4 mile was a 12.19 @ 109. Shifted @ 6200 & crossed the line @ 6500 rpm.
It's mostly a stock short block with stock iron heads. I'm thinking we've still got about another .3 in the 1/4 left on the table.