I was mistaken, it is from the top of the fuel bowl to the top of the fuel, sorry about that.
The .810 is for an 85 2.8 with the 2150a, but to get it to stop overflowing, 3/4 or .810 should be close enough.
There is also a dry setting that might be detailed in the directions with your carb kit. This measures the gap from the top of the gloat to the top of the fuel bowl. For an 85 with a 2.8, my ford special specifications book has this at 1/16", the car kit sheet had it at 7/16", I see some specs for a carb with an E37e date code in another book using 7/16, so I'd probably go with that.