If it was me I would go with the 2 chamber Flowmasters. They wont give you much more HP but will make the car louder and I like to be heard when I pull in. Like Zach said change the cam, cam and lifter kit is arround $175 for a good one and that will give you a dramatic increase in HP.
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73 coupe, 351W, GT-40 heads, edlebrock 750, offenhauser intake, .488 lift cam, 2.5 exhaust, 2 chamber flowmasters, blah, blah, blah...
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