want to lower my 1984 ford f-150

Does anybody make kits to lower my 1984 ford f-150, ext cab, 8ft bed. and i don't wanna bag it, i just want a 4/6 drop so theres no gap between the tires and the wheel wells. does this truck have torsins like mazdas? what performance parts are there out there for this bad boy. its got the 351 windsor in it. i have only found dual exhuasts.