packrat, I really don't know what to suggest for you.......but here goes. Of the CK / B models I have worked on I don't recall that much oil being in the bellhousing .... if any at all.
I have just gone through this entire thread & most of the attention is focused on the shuttle & very little on the convertor.
Can I refer you back to page 4, my first post. While it was apart, did you look closely at the main convertor housing, at each 5/16" bolt drilling to be certain none were cracked?
Did you end up replacing the bronze bushing in the hub? (#9)
The seal rings (#7) were they replaced & was there any wear in their sealing area?
On page 3 post #39 you mention oil coming from holes at the convertor flange area, what did that look like on your re-entry effort? I know the manual does not state it but it may be a good idea to seal that flange with some loctite 515.
If there is meant to be oil in the bellhousing (as some CK's supposedly were....) it would logically have to be at the same level as the shuttle, & there must be some type of gallery/passage for the oil to pass between the two of them, or else the bellhousing would fill to the top & begin to pressurise.........I can't really advise you on this, but this seems logical to me & you have the tractor to look at & I don't.
Hope this helps ol mate :drinkup