Hey there new guy. If you are planning on putting a turbo on you have to be careful about what you do to the engine now. A header is off the list because you'd have to discard it when you put the turbo one on. Any mods to the induction system will have to be done in a turbo compatible way. I'd do some lower gears if I were you. Like 3.45s maybe. It'll make your car accelerate better. Here's a link to one site that sells gears for your 7.5 axle-
Ford 7.5 Inch Ring & Pinion
Don't go too low or you'll kill your gas mileage and make the engine scream for mercy. Plus, when you add a turbo you'll be making A LOT more HP.
Also, start a thread in introductions to intruduce yourself and so people on here know a little about you.