It sounds like the Aviaid Mangusta oil pan is not know to you guys? Perhaps I am wrong.
Here is a link to their page on the pan, and here is a picture of it.
The pan is designed to alleviate the clearance issue. I don't have a 'goose so I can't guaranty anything, just that they do make a pan.
I suppose that you may have a perspective of wanting originality BUT if that is your intent, I think you are going to have ALL of the original oversights?
I would speculate that the value of a Mangusta in the future is going to be to a knowledgeable buyer? If that was me, I'd want the oil pan clearance issue solved?
I believe this pan is 1" shallower like what Shelby did with the 289 in the "Cobra Daytonna Coupes"?
It IS NOT a T pan. The illustration of the pan is not correct. Look at the picture of it.