I think putting a chip in your truck would help you more than a throttle body spacer since you've already got all those upgrades.

 

What about a Ram Air hood? That could get you more power too.

 

I agree with V10, I have a '01 F-150 4.6 I think it is a fine motor
but the gearing is out of line. I use K&N filters. and Change all
The fluids Regularly. so far great truck.....by the way any master
gear heads out there have a special voodoo spell avail to help
me get the rear spark plugs out,50,000 time for a change.....
i would like to catch the design team in a dark alley who thought
that 4-5 inches deep,under the fuel rail,against the fire wall,under
the throttle body was a great plan!!!!!!...............dave