I could offer advice out the ying yang here, but at the end of the day you need a highly skilled, very patient bodyman to assist you...we can be plied with alcohol and steaks...its been known to happen.
The starting point for your B Body is always the front upper door edge and cowl panel. Set height and gap there first using shims and plastic fiber sticks (4mm) as your spacing guide. work down the fender edge towards the bottom aligning the bottom of the fender to the rocker panel, shim if necessary to obtain flush. From there work to align the fender top edge to the hood, ensuring the hood to cowl gap is correct. The principle is to align movable panels to fixed structure, ie: cowl, rocker, 1/4 panel etc. It is the foundation from which all panel alignment stems...All my words cannot replace the hand skills and finesse that a bodyman can offer you. Body spoons and tape are a huge asset as well as knowing when and where to pry! Good luck, if I was closer I'd stop by.
-J