Question about Stromberg 2 Barrel Carburetor

1966 polara 318 motor, Pulled the carb off and am in the process of cleaning it out. My question is: If you hold the two main jets up to a light should you be able to see thru them? I can blow compressed air thru them and get a very light stream. but when I hold them the main body assembly up to a shop light and look down into the jets no light. I don't want to pull the jets out because you need a special jet wrench tool and I don't want to damage the thread on the main body.

thanks.