Plugs look good, no need to do much else. As long as the truck starts and runs fine, the actual time setting doesn't really matter. Being advanced is good, fuel mileage will be better this way. Todays fuels are better then those of fifty years ago even with the corn added, so timing settings don't really apply anymore.
Drive it awhile and see what the fuel mileage does and how it acts when the weather gets hots, you may find it's just right, or needs a little tweaks.
Joe
