+1 on the mtb crankset. You can get down to a 22 ring with those. Sheldon Brown also claims that you can mount a special 22 or 24 ring on a normal road triple, but I've never seen it done.
Here's a good website on major hill climbing (incl. Mt Washington) and gearing. Go to the climb central part. Short answer - I don't think 39x27 is gonna do it for you.
http://northeastcycling.com/