So that said Elbert... and I have asked this on mud before to no avail: What it the most off-the-shelf/packaged path to a v8 swap into... a 40... a 60... whatever?
There MUST be a path that has proven to have the highest likelihood of having all of the "issues" solved.
Ideally (maybe foolishly) I was looking for an instruction "kit": "Source THIS ENGINE EXACTLY, this transmission, these headers, this master cylinder etc etc" I KNOW that that solution will not be for everyone BUT I think there would be a good number of people that would be FINE with following a well trodden path rather than staring down the rabbit hole into the scary darkness of "you will have a lot of issues to work out"... I know Downey had a book (and I have a copy) but it is somewhat outdated and still is not a single path to getting it done, close but not quite there.
I'm not the expert but here is my view...(see post #7 to this thread). The bullet proof GM V8 swap is this....in my view, based on reading and looking at this over time and looking at what's been done. Again I'm not the expert but here is my view. (1) a modern 5.3 or 6.0 GM SBC, (2) a matching GM 4l60E or 4L80E automatic transmission (3) The stock FJ60 split transfer case (4) the appropriate AA adapter to mate the GM transmission with the Toyota transfer case (5) Custom radiator fan shroud (6) Toyota or aftermarket 4 row radiator. Other drivetrain components can remain stock. Pick your poison on Standalone engine harness and ECM/PCM programming. Will potentially require relocation of the cross-member that supports the transmission mount, will require some welding/fabrication on the engine mounts (some used AA mounts like I have...with no issues).
Will potentially require modification to length on front and rear driveshaft.
I'm not a big fan of the mark's adapter (for manual transmission adaption) but that is an option (I have one)., I think the adapter between the gm transmission and the toyota transfer case makes for a better choice ...of course with that you are running a GM auto transmission.
See this thread...for a similar approach to what I describe with details.....
Cam's FJ60 is Gittin' a Heart Transplant this is one of the most recent threads listing what was done and providing most of the details on approach.
It was referenced in this thread somewhere but I did not go back and look where I noted it (see post # 8 to this thread). No need to change master cylinder or brake setup unless you want to. I would run GM manifolds over headers.
Look at swaps that Georg at valley hybrids has done, consider what the shop ACC has done..among others. Go read Cam's entire thread from start to finish....
Edit...add to the mix...its my belief you should run the GM fan clutch and fan from the GM donor vehicle or something similar. I run the GM fan and fan clutch that match the h the year model of my engine 1999, Gm typically runs the same cooling in the half ton pickups and suvs and 3/4 ton trucks and even in some of the 1 tons...the difference between the vehicles is the size of the radiator. Generally the water pump, the fan and fan clutch are the same on these 5.7 vortec powered trucks/suvs.