Another 904 trans ID

Jumping/reviving this thread. I picked up what was listed as a 904 transmission. He said it was behind a Magnum or Cordoba. I knew it was a lock-up 998 or 999. Pretty sure it's a 1978 but the 10000 day code comes back as 1963.
Would like to know date and which is it? 998 or 999? What does L-STALL mean shown below? Pretty much know the answer but can I use my 72 904 valve body in this trans?
Thanks

Numbers are PK 4505162 0251 3905

From the net:
4505162
TRANSMISSION ASSEMBLY, 3-Speed Automatic, A727,A998,A999
A999, w/STD Extension, B1,2 w/5.2L Eng., L-STALL, w/Electronic T/Converter Lock-Up, Up To 3-15-1991

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You will need to use the lockup converter that hopefully came with it. Your other one won't work, and the valve body that is in it will need to be retained to lock up the converter. Looking at how someone had the kickdown lever tied back, I hope you don't go thru all the work to get it in and then find out it's toast! :(