hanging unloaded doors?

Hey all,
I'm hanging the doors on my 67' FB barracuda and they are empty
and I have a few questions for those of you who have done it.
Do I need to leave them a little high to allow for the weight of the
hardware and window glass? If so how much? does anyone know
about how much all the hardware and glass would weigh? and what size gap would I expect to have at the bottom?
thanks Scott