Look to gain 3-5 horsepower from any of those, all a matter of what you prefer the most.
However, since someone will bring it up, if you have a fully built engine with ported intakes and head work with full exhaust, a proper length intake with a proper size filter could net you very large gains.
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"I'm not driving too fast...just flying too low"
Mine:
-87 ranger- broke
-03 SB Cobra vert- 2552 of 5082 Born 02/25/03
Our's:
90 7up vert - new project