Unported head quickness?

My old engine - 318 with a 360 crank (349 cui) - Unported 360 587 open chamber heads with 1.96 tulip valves, skimmed flat tops, Comp M282S retro solid, 1 5/8 headers, twin 2.5" system, 3.89 gears, 27" tyre, 3500 converter, 3650 lb A body,

13.24 @ 105.5mph on road tyres (Firehawks)