Before I break down and install a Weber. . .

Can someone tell me where to find directions for properly setting the 4 adjustment screws on my aging carburetor (2barrel)?
Truck is a 1979 20R, manual 5spd, all OEM.

Thanks. This is driving me crazy. Never did a carb before and obviously underestimated the task.

 

I just found the right thread. Will follow up after more work.