Nice thread, Bruce. I, too, am in the process of doing the BBP conversion. LMAO, I have both a 3 and a 4 foot cheater bar that I have only used for the purpose of removing the UBJ.
All of the 73 > A-bodies use the larger upper ball joint. (Truth be told there are 3 different ball joint sizes, but the third only shows up on trucks and some early Imperials.)
Attached a photos of tools that are in some cases necessary and others nice to have. For instance the smaller ball joint socket is not needed if you drop the upper control arm and spindle as a complete unit. It's heavy, so watch out.
From left to right:
Torsion bar removal tool, tie rod separator, ball joint separator (aka pickle fork), large upper ball joint socket, small upper ball joint socket.