Unported head quickness?

1973 Duster 3270 race ready with driver
360 .040 over 10.65:1 (Stock rods with ARP rod bolts with Speed Pro Pistons)
OOTB Edlebrock RPM heads
Victor 340 intake
Holly 750 DP
Comp Cams .519/.524 hydraulic cam
727 with 5000 stall convertor
Dana 60 with 4.56
29.5x11.5 rear tire
Shifted at 6000, went thru traps 6200-6400.

Ran a best of 11.50 n really good air, but typically a 11.60-11.70s car.