Well, with the 3.73 gears you're going to be alot quicker off the line (of course). :D That's always good! With the 4 barrel, you're going to use alot more gas, for one, but it'll add some horsepower. I'm not sure how much it adds for the 302, but on a 289 Hi-Po (mid-60s), a 2bbl would get 275 hp, and the 4bbl got 289 hp. At least those were the book numbers. I'm not sure about actual numbers. As for the headers, they always add a little horsepower, too, which will vary upon application. If I were going to do all that, I'd go for a true dual exhaust, too. Opens up a little more of that can of Whoop-Ass! ;) LOL
Rick
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