Unported head quickness?

1972 Duster
70 340 30 over TRW 10.5 pistons, stock rods and crank, X heads Just a very little bowl work, stock valves, solid 528 cam Victor 340 intake, 750 carb, 904 trans, 8 3/4 430 gears, 002 003 springs snubber, ran 11.62 at 116mph