If he had survived, STONEWALL GOES WEST. It's a good read, if you enjoy alternate history.
Stonewall Goes West: A Novel of The Civil War and What Might Have Been (Stonewall Goes West Trilogy) [Kindle Edition]
R.E. Thomas (Author)
Alternately, what if Davis left Johnson in place?
SHATTERED NATION by Brooks, Jeffrey (Sep 24, 2013)
$6.99 USD USD Kindle Purchase
The second one even has a butterfly (!?!) at the point where Davis makes a decision different than he did in reality!
Both are good reads, with some fine battle descriptions. The Brooks novel deals extensively with politics north and south, and gets to the end of the war (with Lincoln failing re-election in 1864) but with the stage set for a sequel, as the victorious Confederacy now has to deal with the long term consequences of 100's of thousands of slaves who were emancipated -- and 10,000s of whom served in the Union Army -- who are now back in Confederate territory but are not likely to be easily returned to former subservience -- or at all!
My old professor Frank Vandiver, who knew as much about the South and the Civil War as anyone, always argued that the very process of defending the Old South, including slavery, was bound to destroy it, albeit more slowly, even in the event of the Confederacy winning the war. I expect he was right, and look forward to Brooks' sequel. The heroes of SHATTERED NATION are Cleburne and a somewhat reluctant Joe Johnson, with Cleburne's rejected proposal to arm slaves very much a factor in politics after it becomes public.