The newest Range Rovers have the XJ8 Jag engine bored out to 4.4
The slightly earlier ones had a BMW engine that sucked, and indeed did what you noted.
2006+ are ideal.
I have a friend that wants to buy a late 70’s Rolls, he wants to purchase a remaned engine and trany and wants me to install it. I like a challenge, should I attempt it or run for the hills? I am confident I can do it, I just wonder if there are any suprises instore for me.