I have read the Haynes manual, read Muir's book, cracked the case and
cleaned it and still can not figure out what engine I have inherited. (I
cracked the case because when I drained the oil, water poured out.)

The only identifying marks are a "014" stamped on the flywheel-side of
the case (on the outer flange face at the top) and:

2BR Brazil
20 000.101.101.4

on both sides of the case at the sump.

Any help would be appreciated since I'm unable to go forward with the
rebuild without knowing what case this is.

Regards,
Animal