How's it happen that you've plotted a relatively unique build, nestled the engine in the chassis, body around, yet there's only 20 posts in this thread?
Hell, a clicking birf thread in the 80 forum will be page 6 in two days, and (semi-self loathingly stated) I can manage 10 pages before ever taking delivery of a project, none of which are as in depth as this.
Prolly too late to debate the merits of I6 versus V8, now....
That looks bad ass, perched on plywood..... but obligatory, so I'm getting out of the way, now:
You should've run a 1HZ, H55F, BF1A and been done..... ha!
Anyhow, semi continuation from other thread and messaging, although it'll seem out of place, since no previous discussion has been had, here.
Disclaimer- my expressions of knowledge are 'academic' in nature, loosely defined, having now spent a few years trying to achieve a very specific goal, that includes an H15X and/or HFXA.
The only deravitives I know of with the combination you're discussing (2UZ/H151F) place the shifter behind the intermediate plate, via 36107-60030, which Rick D confirmed to be 7" further aft than the common H151F.
(Disregard the base relation to the pan, as it's meant for H55F/BF1A, but note where shifter is in relation to intermediate plate.)
Certainly electronic implications, but the H151F equipped UZJ100 appears to have been HF2A equipped. As we know, any HFXA will bolt to any H15X, but I don't think will work with the HF1A you have, because of the shifter orientation.
If you keep what you've got,can swap the H151F shifter to 7X, which, I'm assuming to be more comfortable in a 40s driving position. Don't know about the transfer shifter, but betting it could be cobbled to work, or swapped for a 7X derivative, that's, again, nothing more than a more modern 40.
On the transfer case length, should that become an issue and you need to extend, an HF2A(V) housing will mate to the HF1A, output shaft will swap, and, removing the (V) and tossing in trash where they all belong, can extend the rear output flange by 5" for very little effort and/or money.