I think the FJ60 2F swap should be a piece of cake compared to a Chevy swap...
It depends on how you want to count it. The Toyota 3 speed will work with the early cast iron GM bellhousing that also has mounting pads to eliminate the need for a cross member. You could also locate the SBC to eliminate the need for custom drive shafts. The split transfer case will need new drive shafts and a parking brake and these are not cheap. You want to go into this knowing everything it takes and what all the options are.
I like 2Fs and I have no problem with this choice, but it is not a drop in swap.