The house may have historic signifiance. Many of the Sears homes were built in the bungalow style. It does not hurt to have the historic documentation and blueprints available as part of your marketing strategy. Having blueprints is valuable, but may not translate into a higher selling price.
Most likely, the conditions of your local market are going to dictate value. The same kit house that sells in Pittsburgh PA for $50,000 may sell in LA, CA for $500,000. Price really has little to do with historic significance. Kind of like owning a built-in pool, some people will view it as desirable (craftmanship, history) and worth some extra, others will consider it a detraction (dated, disfunctional) and wouldn't buy it if it was the last place on earth. Ask your agent.