What OBD1 horsepower mods?

Hey fellas just trying to get an idea of what I can do with my 5.9 before I drop it into my Duster. Hughes claims to have a cam that will operate in it. Lift in the low .500. Wondering, will the computer support a little more compression? How about some head work? I've also switching out the intake will help. Will the computer function with headers? Let me hear how you have modified your OBD1's?