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This is a family orientated forum so your opening title is inappropriate to be honest - surprised it has not been redacted as yet.
There is a lot of information across the various pages, and usually requests are responded to fairly quickly. There will be a lot of info on the GU RD28 as a package. I had that engine in a GQ, then did an engine swap. Difference was the GU has the electronic control and the GQ straight mechanical. I found the RD28 a motor that liked to rev, but was lacking in torque. I never experienced the dreaded head gasket blow due to heat, but am sure I dodged a bullet. I added a Marks 85% gear reduction to the transfer case and transformed it off the road in hilly country, however the gap between high and low range then became too great and effectively crippled it in sand - compromises all have their strengths and weaknesses.
Lastly welcome to the forum and reach out when required.