Not sure what you're interest is in swapping to something different. Sounds like you have a good running truck as is. If you want a little more performance/pulling power, just clean up the exhaust flow and with the 4.88's maybe little more camshaft in the 210/[email protected] range to add some mid range torque.
I completely agree Rick. It's a shop truck that we use for deliveries at our manufacturing business. One of those "should leave well enough alone". I'll likely do that and leave the "tinkering" for the hot rod projects.