Well I had an FJ80 - and while the motor was a monument to what GMC could have done if they continued to build a 1950 truck engine for 40+ years - it's not the same as the FZJ, that's a lot better and the newer V8's - should be better still even if you lose some of the low end torque.
and there are a lot more Toyota suppliers - than Liberty suppliers
When I was looking around Downey, Advance and Mark's all made adapter's - now Downey's out of business.
however Marks
http://www.marks4wd.com/ Advance
http://www.advanceadapters.com/pretty sure you can get a bellhousing or transfer case adapters depending on the pieces you want to keep.
and I assume you found them - but a couple of great Toy websites are IH8MUD and Slee's
http://www.ih8mud.com/,
http://www.sleeoffroad.com/however some of the engine swap links on IH8MUD's tech links are dead - but there are still some writeups on site.
also CRD_Joe - was able to get Toyota Diesel parts - and do a Factory style swap on his.
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2005 CRD
stuffSkeptic quod gratis asseritur, gratis negatur