The conventional wisdom is that for the effort involved, there's always some combination of Chevy V8/Toyota diesel/cobbled-to-your-exact-needs bastard 2FE/2F-TBI and Toyota and GM/NV/etc. running gear & adapters to put all of it under the truck. The thinking is that'll one of those is guaranteed to make you happier than any other option unless you got the drivetrain for cheap/free or have some other really specific reason to use something else -- things like really nice Mercedes and Isuzu diesels, Toyota V8, etc. builds come to mind.
If you're willing to ditch the 60 axles, a Vortec 5.3 or 6.0, NV4500, NP205 (IIRC, it's been a while since I looked into full-size t-cases), and 9-inch front and rear axles in your desired width and pumpkin offsets will almost certainly be cheaper, fewer steps, and better-performing/suited to the 60 than any manual 4x4 drivetrain in a Tacoma/FJC/etc. If you want to keep the 60 axles, I haven't seen a better solution than adapting between your desired engine and a split transfer case, or between an H55f (and split case behind it) and your engine.
But...this is all 'conventional wisdom.' I actually feel like, for the difficulty of *any* EFI engine swap into a 60, it's actually gonna kinda be a wash/up to you to plan well or poorly and it'll take longer and cost more than you expect, and will either make you happy or not when you're done...and you can't actually know before you start. That said, I'd rather have something well-explored and 'figured out' if the goal is to get the swap done fast, *or* something unusual that I haven't really *seen* like a Ford 300 straight-6 with a megasquirt TBI on it.