Neither really from what is in my library. SAI modified stock
oil pans well into 1965 for Cobras, GT350 R-Models, and GT40s. The first magazine picture I remember showing an Aviaid (spelling) brand
oil pan was for a 427 Cobra. I have the magazine some place. I think it shows a race car and red street car in a comparison test. By 1966 the Shelby catalogs shows what looks like an Aviaid made steel pan for 289s. The SAI fabricated pans are a lot different that the Aviaid ones I have seen on all manner of Fords since the 1970s.
I have seen a GT350 R-Model version of a SAI made pan at more than one convention for sale at big dollars. The early GT350 race cars used a Cobra pan, which has a long sump, or an aluminum street GT350 pan, or at the end a fabricated steel pan like the Cobra one but shorter so the #2 cross member in the Mustang chassis did not have to be replaced (Ford bean counter savings) with a custom one required with a Cobra length sump.
Several of the photos supplied by Dave Freidman (spelling?) for books show examples of the various fabricated pans SAI used on Cobras, King Cobras (Cooper-Monacos), and GT40s.