I warn you puting alloy parts on is not a grate idea, as it will just brake else were and cost more to fix, the best hop ups for this truck are
Mid/stiff springs to help handleing and stop rear end power dip
A tuned exhaust pip set to up your rpm, as that engine is mostly torque and will make it faster.
If u want to make it handle evan better remove the little preload clips from the shocks it makes a big diffrence and set camber on the rear, once this is done it will slide better witch helps avoid roll ovas.