Extra hp out of my 340.

AJ is spot on this one.

Glenn, have you considered a turbocharger? The beauty of a turbo is great highway drivability by being able to keep higher ring gears like you have combined with plenty of power from the turbo - only when you need it. I doubt it would work on your 340 - too much static compression. However, a stock 318 is turbo-ready in many ways.