Sell it, I let one sit in my side yard rotting away for almost 2 years before I finally wised up and let someone else get some use out of it and got some money for something else.
You tryin to come into the 7.3 forum and make people believe a 6.0 is better than a 7.3 is gonna be about as easy as you goin to an Army forum and convincing them you're not a pog.
The 05+ trucks are way nicer. The reason I got rid of my 7.3 was because it rode like a log wagon. My next truck will be a 05-07 6.0. Prolly have a 6.7 cummins on the stand for when the 6.0 gives up the ghost though.
I feel like the reason aftermarket shops see more 6.0's is because there are more of them, and the average owner might have a bit more money, maybe be an older gentleman, that might be weary of taking their truck anywhere besides the dealership.
Add what size (cc and nozzle), who built them, and mileage on them and you might have a chance of sellin them. Oh and put them in the CLASSIFIED section
Take the rear most injector out first, then pull the rest. Lay the valve cover up there, unplug the 42 pin connector, spin the engine over, drop the injector in, tap with palm or rubber mallet, torque hold down to 120 in pounds