If its in your budget, check out the cummins swap. Simple and reliable. I know being in AZ, a rainwater system isn't going to net you a lot. Keep it at 55, you might put some skirts on it, but beyond that keeping it properly tuned up will help. If you don't want to swap motors, might look into a supercharger/turbo charger setup. A 460 is great for its intended purpose. Not good for much else.
