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Cheap Mods:
Bore the TB out (search for some write-ups on this)
Remove Bug Shield (free)
TB Spacer (many people say that this does not much but if you want to drop $70 it might give you 1/8 MPG increase and 1 HP)
Higher cost items:
Air intake (If you do this mod don't use a oil filter, keep a dry cotton filter, and get a kit that has a heat shield)
Exhaust Manifold (alot of people replace with an APN manifold)
Exhaust work (high flow cat from summit or jegs run about 80 bucks)
Remove the Mechanical fan and install an Electric Fan
evern higher cost:
Ford 5.0L 4 port injectors
Chip (if you like to spend 300 bucks on a few HP)
If you have 3 + grand laying around:
Stroker kit or Stroker motor swap
Supercharger or Custom Turbo (some one does make a kit for the 4.0L for the Supercharger)
What size tires are you running?
if you want more pep and low end TQ then you can re-gear and put some 4.10's in if you still using slightly larger then stock to 32's. for 33's I would run 4.56 to 4.88 gears
It makes a difference what type of power you want. What do you intend to use the extra power for? Street racing, hill climbing, dune riding, rock climbing, etc?
Not to get of from the OP but is the Comp 68-232-4 good for a stock (non-stroker) motor? A quick search looks liek most are using this cam with a stroker...