ICON 9976 with Magnum Heads?

As mentioned before, with a re-stalled converter combined with 4.30:1 gears, you could go with a better (not necessarily more) cam. At 10:1 or better, I would be inclined to go with a modern fast rate cam, specifically the Lunati Voodoo 262 hydraulic with accompanying mods that may be required with the Magnum 1.6 rocker arms.
Voodoo Hydraulic Flat Tappet Cam - Chrysler 273-360 262/268. If you’re wanting to exceed your hp goal and are running a performer rpm or the like, you could go bigger. The 268 Voodoo is a stout option, but probably more viable with that 4.30 gear, being your speed at 60 mph with a 28 inch tire (accounting for one inch of growth at speed) is going to be 3000 rpm.
Voodoo Hydraulic Flat Tappet Cam & Lifter Kit - Chrysler 273-360 268/276