Unported head quickness?

66 Valiant, 2700 lbs with driver, 225 slant stock short block, unported head milled .100, 340 valve springs, and a .460 lift Crane cam. Headers, Offie intake, 390 Holley, MSD 6a, 9 1/2 inch Edge converter, 3.91 gear. 14.46 in the quarter, on motor. 13.2x on spray