With those heads and that cam you could make your hp goals without the 454 crank. Use a 4000-4500 stall, 4.11-4.56 gears, 26x10" slicks , and build the engine for 10.5 -11:1 cr.
If you use the 454 crank then you also need to use the 454 flywheel and balancer (externally balanced).
Better to build a 496. 100 more cubic inches for the same money.