to lift a gm truck with solid axles, all you would need is lift blocks and maybe a hi steer pitman arm, "ifs" gm trucks will need a whole new front end and cost in the range of 1500, in hand, and its a lot of work to install, I'm gm type of guy so i would never recommend a ford, ever! because of the trans and front ends always blowing apart. (and the old ford trucks are rattle boxes) and ford 4 wheel drive set up are worth less, most have open front and rear diffs, right rear drives and front left drives, i see more fords stuck in the snow, so sad.
if you were looking for the truck to be a work truck and needed it to haul lots of weight i wouldn't blame you for wanting a ford as they do tend to carry weight better, but a f-150 don't support more than 1/2 ton at all.( its a girls truck)
and for either truck type you could always go with a body lift, for 100 bucks, and do it in your drive way in 3 hours time, or less, and it would still drive and ride the same as it would stock, and if you go body lift get the bumper re-locator brackets or it will look chit.