Which A-bodies do big blocks fit best in?

here at a buddies place and was looking at his yard of cars and was thinking that maybe one year(s) of a-bodies allows better installation of the B-RB engines than other models. I was thinking the 1973+ was the best year, but he insisted the 1967-69 were not problem if you went with manual steering. Not familiar with 1970-72 models as in engine compartment width and height. What is some experience that you guys have had on these models packing big block engines fitment?