wheres the lowend tq...
Running that size cam, I am assuming that you are wanting an all out race car, and not a street car.
The only way that I know of for you to get more low end, or have the power come on quicker, would be for you to lighten up your entire rotating assembly.
Lighter pistons, lighter rods, and a lighter crank.
If you were running a manual transmission, a lighter flywheel would help as well.