Mod Advice for a 5.0L Cobra

[94IndyCobra]

Hey Everyone,
I recently bought a 1994 Indy Pace Edition Cobra, and am looking for some easy HP increase for relatively cheap. I previously had a 98 GT that I modded a lot, so I'm a lot more acquainted with the 4.6L.
I have installed cat-back exhaust, an x-pipe w/ two high flow cat.s, a short-throw shifter, and a cold air intake on the cobra. I was playing around with the idea of a throttle body for some cheap gain, can you actually get more than around 5 horses at the crank (almost nothing at the wheels) from this? Also, I was wondering how good mods like headers, gears, pullies, mass air sensor, etc. are for the 5.0L, because I know those were some of the best mods for cheap gain on the 4.6L.
Thanks a lot for your help,

-94IndyCobra