2,5 NA to 2,25 Petrol

As some of you have kindly helped me out on previous other rather scattered posts of mine, I figured it was only wise to maybe make a more "general" post of the stuff I am trying to do. Not only since it gives other members something to "follow" if they like, but also to contain posts and not infect the forum with countless small questions.

If you dont like reading and just wanna skip to my questions, these are the specs of my landrover:
- 2,5 NA Diesel
- Standard trans
- Salibury rear diff, normal in front
- 1 ton parabolic rear springs, normal in front
- no overdrive

Story/Specs
So, about half a year ago I bought my 109 2,5NA landrover (pictures will be included)! And its tons of fun! Ive put close to 4k kms on it already without all too much problems.

in an effort to make the car a bit more "comfortable", read: bearable. Ive set out to try and reduce the noise the diesel engine generates. Ive bought some deadening mats which I still need to install to the bulkhead, but also a cheap 2.25 petrol engine.

Naturally, the idea is to swap out the diesel for the 2,25 petrol engine to reduce noise. However, a secondary goal is to increase the MPG (or as we measure here in holland, KM/L) of the landrover. Diesel currently does about 1l/8kms, not cracking. By adding LPG to the system, I can get around 1l/21kms for the same price as a liter of petrol. Pretty nice.

Questions
So, naturally im new to the landrover platform and especially to engine swaps. I have done some v8 swaps, but those are all american platforms. Which are pretty easy.

I want to reuse as much of the auxillary parts from my diesel for my petrol. Course not everything is usable.
However, is there some sort of "list" of the extra parts needed for a conversion like this? I feel like this is pretty common, but I cannot find a definitive guide. If there is one, this might spare me/us alot of questioning.

but maybe the biggest question is: can i do what i want to do? Is this swap doable?

Comments alongside pictures included
I included some pictures, most notably a picture of my car (ofcourse). and also some pictures of the dissasembly process of the petrol engine.

Closing
Thanks in advance for all the comments and discussions which might form here. Im always approachable on here or on my instagram @tscarsandbikes for more detailed conversations/help.

Thanks!
Thomas

So update on the crankshaft, i seem to remember i saw a very distinct groove yesterday. This groove today seemed a lot less significant. However i could still feel it. is this a reason to move up in bearing shell size?

I read the measurements of mine, they are still the rover STD ones. Which i can only assume are standard size. See pictures attached of wear on both the shells and the shaft itsself.

Happy to hear opinions on the wear levels and reccomendations for new bearing sizes!

Thomas