Pat.
I should have said in my earlier post, you can view the image of the birth on ScotlandsPeople (
http://www.scotlandspeople.gov.uk )
Your next move could then be looking for his death record.
If you find that, it will show whether he married or not, give wifes name and re-confirm parents names (evidence you've got the correct one)
If you search deaths from 1855 in the whole of Scotland for William King born 1834 +/- 1 year, there are 9 hits. I've looked at 2,3 and 8 and none are him.
To view birth image will cost 1GBP. To look at the 6 other deaths will cost £6GBP.
If he married, knowing the wifes name will obviously make it easier to find a marriage and entries on the census records.
I recommend NOT using SP for looking up census records.
I hope this helps and I'd be interested if you get a result.
Good luck.
Dave