A little off topic? :spit: Yeah, I'd say you jumped ship on that one. :rofl:
It's not coming along at all, sadly.
If you'll get a good harness from someone or have the ability to pair one down yourself and have a little fab skill (engine mounts and fitting intercooler in the front stack) then it's not likely much more difficult than a cummins conversion because the V8 fits nicer front-to-back than the ol' inline 6 cummins. It'd be even easier if you lose the Allison. Otherwise the easiest way to incorporate it is with the dmax-based steering wheel et al. I can't find anything about the clocking spacing in a dmax column so I have no idea if an old square-body auto column could be made to work or not. Only other thing that'd have to fitted to the old is scoot the trans support back (and maybe spacer but not sure because I haven't made it that far but the mount is shaped the same) and either put the TPS on the old throttle pedal or mount the new pedal in there. I'm leaning towards the later.
And for mine, as of now, I still plan to do a body swap rather than an in-chassis powertrain conversion. That however would NOT be the ideal thing to do for a racing setup IMO. Modern frames and gear are far too heavy.