I've posted just about all the information I have on this regiment.

I searched Worldcat but did not find any books on this unit.

Regarding your ancestor, you might want to follow these trails:
https://www.familysearch.org/learn/wiki/en/Arkansas_in_the_Civil_War#Compiled_Service_Records

Confederate Records
Compiled Service Records

The Compiled Service Records ($) (Fold3.com) of Confederate soldiers who served in organizations from the state of Arkansas are available online. In the future, these records will be made available at no charge through the National Archives web site. The service records are also available at no charge at National Archives research rooms.

The compiled service records consist of an envelope containing card abstracts taken from muster rolls, returns, pay vouchers, and other records. Service records may provide rank, unit, date of enlistment, length of service, age, place of birth, and date of death. For more information see Confederate Service Records.

Pension Records

Arkansas pension records for Confederate veterans are located at the Arkansas History Commission.

A searchable index to Confederate pension records is posted by the Arkansas History Commission.

The Family History Library holds microfilm copies of Arkansas Confederate pension records, 1901-1929, on 121 films. The pensions are alphabetically arranged. (Family History Library Films beginning with 1722443)

Copies of individual pension records may be ordered from the Arkansas History Commission.