Unported head quickness?

not sure if we will count a bowl blend in the ported category? I don't, but if so then feel free to delete. here goes....

71 dodge dart, suspect weight is around 3300 with driver, 408 with 11-1 compression, comp cams solid roller and lifters, air gap intake that has been gasket matched, 750 AED carb, 1.76 powerglide trans, 8 3/4 with 4.86 gear, 1 5/8 inch headers, 1 inch open spacer, MSD distributor and 6al box.

Heads are RHS X heads that have been bowl worked by IMM Engines. no port work to the runners at all. 1.5 ratio Harland Sharp shaft mounted rockers.

car has been 6.832 @ 99.03 mph in the eighth mile, and still tuning.