Headers allow the engine to "breathe" better by allowing more exhaust to escape and reduce back pressure.
They won't do you much good unless you buy a 2.5 inch exhaust and muffler system to go with that H pipe.
I, myself wouldn't recommend Mac H pipe. I would suggest pace-setter or something besides Mac. I heard too many horror stories about Mac stuff.
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'82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.
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