Ok, so while putting in the Concepcion, I noticed two other cards who could use upgrades, in #10 Lou Brock and #44 Doug Rader.
So it goes...one down, two added.
Here's the current list of cards I need:
10 Lou Brock
44 Doug Rader
46 Walter Alston
346 Ty Cobb ATG
441 Gary Carter
592 Rookie Infielders Randolph
606 Alex Grammas