I am keeping my eye out for them, but it may end up being a longer search than I hope for. I have not found any for sale in any on-line classified for all of BC.
I have seen his build on another forum, it is very nice and similar to what I want to do, definitely has the same feel for what I want to go for. As he says, the 1200cc quad.
I shouldn't have said width is the driving factor, it is part of it, but it all comes down to overall size. The motor that I measured at the junkyard was about 30" in overall width. Actually looking it up I probably measured a EA81 engine, it was in a 1988 Subaru GL 2WD.
I have attached a very rough model of the 88 Subaru GL engine/2WD tranny I measured at the junkyard, along with a Sprint 3 Cyl Eng/Transaxle. There is quite a difference in the size between the two. The Subaru is much longer, has more overhang and appears to be quite a bit heavier (~180lbs vs 135lbs for engines only). Looking at them in person, the Subaru "feels" like a much bigger unit, and will probably end up making the buggy feel like a small truck rather than a big quad.
I think I could be happy if it was about 3" narrower, and around 150lbs engine weight, I would seriously consider using one at that point.