Ok, now I am assuming that you are the daughter of Norman and Barbara, correct? If so it also appears as though your an only child, correct? Where I would start is with the SS death index info on the one I just sent you and the one you found with a death date of 1970. You can go here if you have not done so before http://www.ssa.gov/online/ssa-711.pdf
and order his original application, it is quite interesting as it will have your grandfathers signature along with the info on his first job. We can also do private email if your interested, Can you send me the link to where he was in the earlier census records that you mentioned earlier? Let me know what you would like to do as I will help you the best I can as I enjoy helping others!