I believe the spec height of the float is 1" measured with the float attached to the top portion of the carb and, of course, turned upside down. I have also read that some set the float as much as 1 1/8" in order to reduce the possibility of a leak which is OK as long as there is enough gas to run the car at speed.
I set mine at 1 1/8". Seems to run OK.
Dick