E-rod
Peter. E-Rod comes to mind.
Here is the scoop on the E-Rod. It's not legal in California in any Land Rover.
Here's why...
The LS3 E-rod (6.2L car engine) is restricted to 1995 and earlier vehicles and had a GVWR limitation of 5750 lbs. A D90 is 6100 GVWR. All other models are higher.
The LC9 E-rod (5.3L truck engine) has been discontinued. It had a GVWR max of 7500. Which would have been the only option for the 90/110.
The only option for California is the "engine change" as outlined by CARB (California Air Resource Board) using an LC9, LMG, L92, or L94.