Man that does surely bite!
As far as your situation... A yard motor can be purchased for about $150 running (or $75 out of the yard and you pull it). Check out Colorado Auto and Parts in Englewood if you are inclined. You can also purchase a remanned motor for say $1000 at your favorite parts store in town. I would chek out the news paper and like the Tom Martino web site for recommendations. I have heard bad things about Ryan Engine Exchange, but don't know their work from experience.
Just $.02 --Mike