I remember reading that a big block should use the C-body big block oil pan (187, I think) for linkage clearance. Of course, a torch and a hammer would accomplish the same thing, but watch out for your pan baffles, if you have them.
I'm with demonseed on this one, I have a 71 duster with a 383,mine has spool mounts tho,, it has a 187 pan and has great clearance, it was a /6 , 73 k- frame. I personally would change the pan before I would dent it with a hammer, but thats me. Lotsa people dont mind runnin new headers beat up with a hammer too,lol,,,good luck.