You are going to need the adapter plate to make this fit the G63B manifold. The specific Weber kit for an auto is the K614 with the kickdown linkage adapter and bracket. Add to it a rebuild kit and you're heading towards the cost of a new 32/36 Weber. You can get the water choke housing to work on the G63B but you have to start with a complete and functional carb to get a win otherwise the usual path is to block off the coolant feeds and use a carb with an electric choke.