CK has a good manual and he has the parts. I rebuilt mine in 2001 and had never done an automatic befor. It lasted about a year. I did a basic stock rebuild .The 2, Real Art Carr's I had done a few years befor lasted 6 months.
Been doing my own for 24 years. Used quite a few kits for all the ones I build. I have PTS and CK parts in my GN trans. All have been blue clutch kits with one red kit for a supposed 1000hp Nova that is still not finish by the "builder". Billet forward is never a bad idea. Even in slower cars. Have seen plenty of stock forwards drums snap in 15 second and slower cars. Wide band. Larger boost valves in pump. 10 vane with hardened rings. Just some of the things that need to be done.