Hi and welcome to mightyram. If they revoke the vehicle emissions on older cars etc in Cal you'll be in luck. The anti pollution gear on these engines chokes the life out of them. Just deleting the EGR, some port work and a retune will get them running super smooth. If you're not sure of what motor is in it - the G54B is the 2.6 and has an alloy timing cover and runs a carb, if it's injected it'll be the 4G64 2.4 with a plastic timing cover. I don't recall when the G63B 2.0 was phased out. It looks like the injected 2.4 but runs a carb instead. Your truck looks like it's in nice shape