I have a 47 3100 that I am putting a 54 235 in place of the broken 216. My plain is to do the Patrick's set-up using the Saginaw 4 speed. I found a two groove input shaft saginaw but the bell housing off my 216 does not mate up with this 4 speed. It is about 3/4" from the holes matching. The guy that has the saginaw says it is form a late 60's vette. It does have the 2 grooves. My question is are there other two groove saginaws or is my 47 bellhousing diffrent than the other year AD bellhousings?