When it's in the pump all the way you shouldn't be able to get you fingers behind it. When bolting the bell housing bolts, the converter should be a good 1/4 inch off the flex plate.....if its against the flex plate before the trans is on the motor the converter is not in the pump all the way.
Filling........if you had the pan off.....dump in 4 liters, start it up add another 3 and start checking with dipstick.