Gonna need some compression, gonna have to switch pistons or mill/replace heads. No factory LA head/piston combo will get you much over 8 to 1 compression and any "summit" or "eddelbrock" (chevy) cam will not do much with that low compression, certainly not low 12s. If you are gonna stick with the factory low compression set up you need a quality custom cam with mopar specific lobes and a tight LSA to artificialy build compression with out loseing flow under the curve. Spend money on pistons, heads or cam, you can't skimp on EVERYTHING!