Many years ago when I cracked the block on my 2TG I sourced a 2T block and rebuilt the 2TG engine around that.
The only mod necessary was to block off the oil galleries that fed oil to the bearings where the 2T cam was located in the block. This was done by removing the bearings and then having them pressed back in with the bearings oil hole offest to the oil hole in the block.
The only other thing I can think of was to use a blanking plate to cover where the 2T had its mechanical fuel pump mounted.
Apart from that it was all a straight swap. This setup ran great for well over a 100 000km.
But yeah use ALL 2TG stuff and only 2T block and crank bearing caps.
I am assuming you are only trying to do this so that you can keep your engine number the same by using your existing 2T block??