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I think you're getting to the point where diminishing returns will really start to kick in as far as engine efficiency goes. You would probably get much better gains-per-dollar with some aero mods, pumping up the tires as much as you can, or a manual transmission swap. My GTO has a 6sp and will putt along at 1600RPM at your 62MPH cruise speed, the RPM difference between auto and manual would be at least 10% (0.7:1 to 0.57:1 with the transmissions offered in the GTO).
However, if saving money isn't your main goal and you just want to see how far you can push the engine, I wish you luck doing what most people would consider crazy/impossible. I love that my stock LS1 can hold its own compared to cars with smaller engines when cruising, I hope that you can make a more powerful one crush them.
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