I am knee deep in an article for Blue & Gray Magazine on Van Dorn's Holly Springs Raid. The order of battle for Jackson's brigade has been, and continues to be, quite ellusive. To the best of my knowledge the brigade consisted of the following:
3rd Tennessee (Forrest's Old Regiment)
6th Tennessee (Wheeler)
7th Tennessee
3rd Arkansas
I have also found a refrence which includes Ballentine's Regiment (2nd Mississippi Partisan Rangers)but I cannot ascertain if they were involved in the raid. The regiment was definetly in Jackson's brigade in January of 63.