5.8 mods

i have a 5.8 and i wounder what's the best modification that i can put on the engine.
a cam? heads?
i have 1500$ to spend.....

AFR Heads.

Is it a Windsor? For just a little more get a good H/C/I combo.

Stock 351W not out of a Cobra R get yaself some real slugs for that block then worry bout heads cam intake.