1968 is recommended for barleywine because it's a British strain and ,if done right, would be an obvious match for English barleywine. Guys here use it for barleywine with success. But being so highly flocculant (it's one of the most flocculant strains out there), it tends to do its job and drop like a stone. In the case of this barleywine, it could drop out and leave you with a high FG if you don't manage your fermentation. As fermentation starts to slow down, it's best to bump the temp up a couple degrees F/day (up to 75F-ish) and gently rouse the yeast, to spur the yeast to stay active and keep eating sugars. This will work fine, or you could use a British strain like WY1098 that won't give you the flocculation/stalling concerns and is a beast of a strain.