If there was a straight 6 in there you might have some differences from a normal V8 crossmember. There is a pan called a double hump that is used in Mustangs in about the mid 80's, and I believe this pan was used in other cars too. I had a Lincoln Continental with a 302, and it had a similar pan. You will also need the corresponding oil pickup and perhaps the stud/bolt that goes on the center main bearing to support the pickup tube in the rear position.

I have also used a Bronco rear sump pan in some swaps, but they are like hens teeth any more. I hope someone can take you a little further on this than I have, but this might get you started.

Don