Moroso Street / Strip Oil Pan no. 20730
http://www.moroso.com/catalog/categorydisplay.asp?catcode=11956
I have a 402 (360 Magnum 4 inch stroker crate motor) in a 70 Duster, and I know it's a moroso pan, because it mentioned in the paperwork that came with the engine.
Looks like it is the 20710 for a 360 magnum, and I measured and it's 10 inches. The pan is deeper, but not wider. The web site shows a schematic and picture view.
I had to grind about 1/8 inch off the K-member in two spots where the front two corners of the pan are when I installed the engine. No big deal.
As for headers, no problem with the pan, just with the ribs of the block on the pass. side. Don't think they hit on my 340. T.T.I . may have changed their header design by now, but I don't know.
Hope this helps!