Unported head quickness?

STOCK bore and stroke 360, unturned crank, rods not even resized and stock rod bolts. Stock J heads with new 340 springs, stock rockers and original 1.88 and 1.60 valves lapped in. Crane #693802 camshaft kit. Crane double roller timing chain. MP electronic ignition with orange box. Stock 1971 340 intake and 1973 Thermoquad. Carb sealed to hood scoop with Moroso air pan. Stout 904 with factory high stall converter. Flow Tec headers with 2.5" dual exhaust with 2 chamber flowmasters and tailpipes. Car ran 13.99 first time out with 3.23 gears and slicks. Ran a best of 13.46 with swapped in 4.10s and slicks. Was in 1971 Dart.