What to set valve lash w/o cam card?

Well, I got the chance to remove the left valve cover today.
Wow, as Gomer Pyle says, "Surprise...surprise...surprise!" Standard rockers! Must be hydraulic lifters. What a disappointment. The owner of this Duster 340 back in the '70s had two of these cars. He MUST have gotten the two mixed up.

O.K., now I got another question for you guys. Below is the #s stamped on each rocker from the front of engine to rear of engine (Left side....1,3,5,7).....
710 LT 710 T ........710 LT 78 RT........710 LT 78 RT.........710 LT 78 RT

Are these good to go, or do I need to find the "correct" ones? And should I pull the arm and check the rods and surfaces while I'm here? How do I decide if each rocker is in usable condition (where it pivots on the arm)?