This thread frustrates me and I suspect that it frustrates others here, too.
You want to do an "overland build" on your truck. Let's consider what we know:
- The truck is apparently new to you.
- You aren't totally sure what motor you have, yet you are ready to replace it with something, maybe even a GM powertrain
- You want to lift the truck
- You're considering using spacers
- You want to run 33" tires
- You're picking out paint colors
Yet...as far as we can tell, you've never even done a trip in this truck. Do you know what it's capable of? What are its strengths and abilities in its factory form? You don't know.
Do you have any hidden mechanical issues? You don't know.
You're going about this all wrong. You're trying to do some Land Rover Overlander Expedition Lifestyle build but you're focusing on everything that's not important right now and none of the things that are. We are trying to save you from our rookie mistakes but you want none of it.
Look, first things first, quit picking out paint colors and spacers and get this truck out in the mountains before the snow hits. Take it out to the western slope and get a week in the desert and some rough off-road miles on it to get a feel for what you need and what, if anything, needs fixing. Bring your camping kit and think about how you're going to pack it with five people on board.
Drive over Monarch Pass with the 2.5 NA. Drive with some friends who have "built" Defenders and notice all of the problems that their big lifts cause on long overland trips: the broken shocks, the exploded DC driveshafts, the death wobbles, etc. Once you have done all of this, come back home and build your truck. Only then will you know what you want and what you need.
For the record, I drove a bone stock ex-MOD 110 from Galveston to Seattle and covered over 1500 rough, off-road miles. You don't need an "overland build" to get out there and do this stuff. I'll put my stock 1987 Defender up against most any other Defender on this board in terms of off-pavement reliability.