Setting float in a stromberg 97

[39topless]

I did lots of research and it appears there are two schools of thought regarding setting the float in an original Stromberg 97. One is the "dry" method where the float is set level with the carb body or by using a measurement from the top of the float. The other is the "wet" method and here, the fuel level in the carb is measured (not the float) while the engine is running.
It seems to me that the fuel level is the critical factor so I am attempting to do that. Because I have installed an electric fuel pump, I am able to measure the fuel level by removing the air horn of the car and simply turning on the electric fuel pump without the car running.
My question: Could not find a tool in my local parts stores so I have made a "miniature" L- square out of the card stock of a legal pad and have marked the recommended fuel level of 15/32's. My problem is, when I place the "tool" in the fuel bowl, I get en inaccurate reading because of the "surface tension" effect of a liquid next to a solid . The liquid rides up the carb wall and up the tool surface. How can I compensate for this?
Sorry for the length of this post and thank you for your reply.