I did call Mancini. They stated it is a direct fit from original molds but "aftermarket reproduction" so there could be differences. I figured atleast the tolerances would be the same since Mancini was stocking it.
One thing I have found out is that this casting is being offered in all the major parts stores and web pages by whatever manufacture "MA" is.
Did a forum search and web search yet nothing came up.
So, I thought Id ask for ideas If others had come across similar issues.