Save your money on the cold air intake.... total waste of money. Changes the appearance but does nothing for performance.
Install the largest transmission cooler you can find. Then change the transmission fluid and filter. Don't let the transmission shift into overdrive, put shifter in "3". The best thing you can do for performance is a good tune up using AC Delco parts: plugs, wires, distributor cap, and rotor. Air filter & fuel filter if necessary. Check fuel pressure and leakdown: Key on, engine off, fuel pump running, pressure must be 60psi to 66psi and must remain above 55psi for 3 to 5 minutes after the pump shuts off. Make sure the brakes are good, and you shouldn't have any trouble pulling 5,000#.