I think my problem might actually be with the priming shaft. It was made from a big block intermediate shaft and the diameter is not reduced at the base like it is on a SB shaft. It's not dropping into the pump drive.
I've got a couple SB shafts I can use to make a new one.
Stay tuned.
-Jim
I can fix it... my old man is a television repairman. He's got the ultimate set of tools... I can fix it.