Could that DEB be DEA?
DEA was model designator for 1946 6xxx series engines.
http://www.1954advance-design.com/chev-specs/1946-Chevrolet-t-ser.jpg

The original engine would have been a 235.
http://chevy.oldcarmanualproject.com/chevyresto/4677.htm
Here are locations of engine codes.
Find and post all the codes and members should be able to help ID the engine.

As pvfjr posted, it would have had vacuum wipers.

Some of this info might be incorrect for an export (or foreign-assembled) RHD truck.