That is "Emerald" with 570k Km (not miles).Amen-(Holy S#%t) 2001 LC
Think you got the record
Except a wrecked one I think had 700+
Keep in mind these 4.7 engines- have gone to 1million - documented
Ps Info on a list of replacement items you have done please
You can see about 95% of work on Emerald. In signture box link below. It was my "no start field find", I towed home a few years back. Which is, coming along nicely.