http://www.interment.net/data/us/tn/shelby/memnat/memphis_henhik.htm

Henson, Wm, PVT B 87 ILL INF, Plot: 199, *

Note that the CWS&S doesn't list a "W" Henson in the 87th Illnois. That leads me to believe the burial record could very well be wrong and this is your man. To review search results of the CWS&S go to http://www.itd.nps.gov/cwss/soldiers.cfm

GP