Finally got both the check weight and the pump check ball freed up. A combination of picking with very fine tools and light tapping with a hammer from the back side made the difference.
1) Most likely going to re-use the all metal needle that was in the carb along with the existing seat. They look in good shape. I just bought a cheap kit for gaskets and pump, and I will do some measuring, but sounds like it’s highly unlikely they provide the correct needle and/or seat. Will upgrade to a Carbking kit if we can prove this is a functioning unit.
2) I didn’t have time to study closely, but it looks to me like the metering rod might not be perfectly straight. If so, should I try to carefully straighten it...or am I likely to make it worse? (Or perhaps it’s not supposed to be perfectly straight). Might have been my imagination.
Had to do a bit more cleanup on some hardware last night, but I think she’s pretty much ready to slap back together. If and when I can find a few minutes. Kids’ baseball/softball schedule is gonna start kicking my butt soon.