I know Chassis Research made a conversion kit but has anyone seen this modification other than that ? The only other instance Im aware of such a conversion is the LaSalle transmission.
Oval trackers did some interesting stuff, closed dive shafts fall in and out of favor in North East D.I.R.T. modifieds. The current trend is open after years of closed. I do not any photos but I had a 60s Ford Top loader Ford speed (1st and 2nd removed) that had been shorted resplined, and converted to closed drive line. It was done using a factory plate like shown in your photo. (Possibly or Halibrand C.R.E. part)