Need some help...5.2L

I have an 88 Dak that is 2wd and makes about 400HP at the flywheel with a 360. Here's what we used; KB 10.5:1 compression ratio pistons, large port facory heads, Mopar purple cam .454(?)" lift. Edelbrock intake manifold, Holley 650cfm double pumper and Magnum manifolds. forgot to mention this is an LA 360...