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The return on investment for headers and full exhaust would be forever. My uncle is a power nut, like Super Snake and Z06 owner, nut. He is also a tuner. He believes there is little if any power to be gained from headers on the LS Camaros and GTOs. The only reason to install headers is for the sound. He currently only mods his exhaust for proper noise...muffler removal and Helmhotz chambers are the weapon of choice.
I will say that an engine you can hear is easier to drive for load though. You can hear what's happening. In my Buick, I can hardly hear anything and rely on the UG. There may be some argument for a cam change, who makes a FE cam better than the factory. The E fan should be plus though. ROI would be much better there. If you have a 4.3 V6, I don't have any info on mods, but I would probably not go down the exhaust path. Too much money.
The added cost of a diesel truck would pay for a lot of gas....
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