[urq] Value of Brand New Head Casting?

[urq]

As many listers here know, a long time ago I purchased what I was told was
the last bare head casting available for the WX engine.  I was planning to
use it to build up a worked over WX for my urq.  Well, the MC-2 is the new
basis for upgrades ...

So, now I have this casting, brand new, in the box it was in when I bought
it all those years ago.  The part number is 035 103 351BC.  It is actually
slightly different than the WX head in that it has the passages for the air
shrouded injectors.  If you use the WX inserts the passages would be
blocked, so I know it would work for a stock application ... or the air
shroud parts could be added ... which is what I was planning to do.  I don't
see any other differences.  The head doesn't have valves, springs or a cam,
but it has seats, valve guides, cam bearing caps and all studs.  

I'd appreciate hearing any thoughts on how I'd determine the value of a part
like this ... 

TIA!
Steve B
San Jose, CA (USA)