check this thread here :
viewtopic.php?f=4&t=384 both Mike Levine and Arch Evans are mentioned as sources ,, I don't know contact info for them ,, try contacting John Lanning or Rick Andersen here and they can arrange to get that to you I imagine ,, I don't know about strength of big car versus corvair Saginaw ,, I believe they are much the same but shifter is different and no adapter would be needed to mate big car to bellhousing ,, anyone else have knowledge of that?