First off are there any full body kits that fit a 1991 f-150 custom. Next are there lowering kits for this truck also.

 

Lowering kits are available from a variety of sources. Price and quality vary dramatically. On a truck a lowering kit is not always a good idea. It reduces the hauling and towing capability and depending on how far and how you lower it you can mess up the suspension geometry or weaken the frame as well.

What do you mean by a "full -body kit?" There are glass skirts and valences, roll pans, hoods, probably tilt-off front ends for that matter. What exactly are you looking for?

Go to a newsstand and pick up a copy of any of the various street truck magazines and read the ads. Truckin is probably the largest with the most ads. A lot of that stuff is junk though so do some research before you buy.

 

....ford has great body styling, why would you want to change it?? I would suggest that if you want something with break-neck acceleration, body kits and such, buy a mustang. They have huge aftermarket support for such items.

 

Problem is, he's already got the truck. And a six cylinder pickup is a whole lot cheaper to insure than a V8 Mustang.

91Ford... I'm not trying to rain on your parade here, but you need to have some realistic expectations of what you can and cannot reasonably expect to acheive with modifications. Your truck, stock, probably runs something like an 18-18.5 in the quarter, a little better if it's a manual and you know how to drive it. The Gen 1 Lightnings with a warmed over 351 and lots of good parts added only ran high 15s to low 16s in stock trim (unless you got the magazine test mule which was a bit quicker.) That's a long way from neck-snapping. If Ford SVT couldn't get there with a 351, you sure as hell aren't going to get there with a 300. Learn to enjoy your truck for what it is.