Dan, I was intrigued by the B-Body fork too, I am going to have to look into it further. The bellhousing that is on Larry Griffith's original SS Dart is the one that says "steel" on the top and the clutch pan and has the casting number 2463230 on the bell and 2206044 on the pan. I have seen these before but are as rare as hens teeth! Here are pics of the bell from Schild's book.