I used the front hangers of a 1980 Chev shortbox 4x4, these are the "long" style hagners, which work with a shackle flip.
I swapped in a set of 63's, so my locations are going too be totally differnt than waht you would need. I'll try to round up a digi cam when I get the change.
A suggesgion when drilling new holes is to measure from, or even use an existing hole in the frame, to mak sure everything is square.
To get the existing hangers off you'll need to grind or torch the heads off the rivets, and drive them through the frame with a BFH and a punch.