Carter BBD on my slant, help with float

Hang on
The upside down dry method is different that the wet method with fuel pressure applied.The dry method of 1/4 inch might be 3/16 or 7/32 IDK, when running, and that might be normal.

But hang on some more, I wonder if float level is your problem at all. I mean that car should be getting 15mpgUS or more. If you are getting only 10 than you have much more serious issues.

If it was mine,I'd start with the basics; verify the choke is coming off,fast, and that the float-valve is not leaking.
Then verify the TDC mark, adjust the valves,and do a compression test.
Then verify the minimum engine operating temp is correct, for your area.
Then verify that the MJs are correct for your altitude.
Then verify that your ignition system has some balls.
Then verify that the power valve is working right, that the PCV is correctly plumbed,that the T-Port sync is close,that the accelerator pump is correctly adjusted, and that all the timing mechanisms are correctly working.
Then mess with the float level.
That's what I would do.