From Carol Botteron's Civil War Units File are two below who may be of help.

George Martin

The CWUNITS file lists people who have (at least some) information on a unit and are willing to help others research it. Some are experts,
most are not.

8th AR Infantry pearceww@rmii.com
8th Ark. Inf. Regt. 1861-5 dewittyingling@msn.com (Dewitt Yingling)