The Jackson Gamers have a page with everything you need to know to start gaming Civil War Ironclads
Here are a set of house rules for “fine tuning” Fire and Fury, the great American Civil War rules set.
I’m not sure I’m on board with all of these.
Honor and Glory ias a set of rules for the American Civil War available at the Honor and Glory Yahoo group. It is a VERY complete and well done system designed for games where the smallest tactical unit is a regiment, which is represented by four bases. It’s playable in nearly all figure scales.