This new 1940 census should help you. Check the states that have come out with index and he will show up there. I believe Familysearch has the 1940 census index of some of the states.Check that out first then less look for the graves on findagrave. The s/s deaath records might show up if you look for that as well.Take the state around Mississippi and look for him there first. He was born in Alabama so search that state first then Fl., Louisiana, Ark.,Tn.---so on and so. Then if no find look in Michigan,Il., N.Y. for the state that would have industry going on. Check the city directory for the name in the large cities.