The US GenWeb Census Project is a free site for transcribing and researching State and County Census data. You may find interesting information in the online inventory. Maybe you would like to volunteer to transcribe or proofread a census to post online. The site also includes information on the 1940 census release.
It seems from the above site, researcher then have access to this site: The Online Inventory of Transcribed Censuses - this link takes you to the North Carolina site listing the counties that have been transcribed.
Currently McDowell is not transcribed. If your group would like to help take this on as a service projects, please email.