Are you saying if I had a 2T-GEU I could use the head and the block with the 3T crank, rods and pistons?
Yes, this is the most effective way of doing it as you don't need to either;
a) change timing gear and supplimentary camshaft into single cam block, or
b) machine clearance in early 2T block, or
c) adjust 3T bearings to suit 2T-G application.
The later 2T-G heads also were the large valve models and featured additional webbing reinforcement and (>260 head number) double valve springs.