The pump and bracket look like this off the car, you may need to remove your fan shroud to have enough space to slide it off the stud sticking out of the head as I had just enough space by tilting it up while sliding it off.
Arrrggghhh I forgot you can't post pics in the body of a post on this site, only at the bottom! when will they upgrade this? You'll have to look at the pics below for reference. Once you get the pump off you'll need to lock two nuts against each other so that you can unthread the stud out of the head if that's what you're attempting to do.
'67 Coupe 289 stroked to 333, AOD, 9" w/3.50:1, PDB, Candyapple red w/red deluxe int., PS, ext. decor group, light group, foxbody seats.
'09 Black Warriors In Pink with glass roof - the wifes Mustang.
"If it ain't broke, I haven't fixed it yet" -Jon