Right Richard, I hope you appreciate this, been out with the torch and got filthy...
Our KV engine block is 034 103 021
Whilst the WR is 035 103 021N... Looking closely at your engine block it 'looks' like it mirrors this 035 103 021N in the photos... ETKA is bit of a PITA, as it carries part numbers of the built up block with pistons etc. Which make it unique to the engine type...
IMHO, you have a WR block....
Either that, or our WR, with original engine number on the block today, as shown at point of delivery new, has the same strange engine type....
Hope this helps Rich...
PS - remember this is the block casting part number, not the 'built up engine type'... So it could potentially be running a different crank/conrods etc...
(It's a WR block mate...

.)...