[Bobcat]

I`m not very familiar with the small block engines , but here are some generalities to check . Always start by making sure the ignition is working correctly and timing is right before working on the carb .
A large portion of carb " problems " are actually ignition problems .

To me , your vacuum at idle seems low , as does your timing ( I have a big block 482 engine ) and idle speed . I run 18 to 20 degrees at idle ( 1100 rpm ) and a max of 37 degrees on my engine . Check your plug gaps also ... and install the spark plugs with a torque wrench .
I found that getting good A/F readings at idle can be difficult because of reversion due to cam overlap , so I don`t pay much attention to any readings until I get to the 2000 rpm range .
Also , check for vacuum leaks around the base of the carb and intake manifold .

Good luck ,
Bob