Unported head quickness?

73 Duster full interior a/c car rebuilt 360 stock heads trick flow valve springs
MP 508 cam weiand action plus intake and holley 750 hooker headers 1 5/8
Ignition MP chrome box 727 trans 3000 converter 81/4 rearend with 3.21 single track
M/T 255 drag radial couldn't hook good some back pedaling
ET 13.44 1.88 60' 100 mph