These are the older versions if they have wooden rooves. That means they have different ends from the later ones. The later ones have metal rooves that fit over sides and ends, whereas the wooden ones fit over the sides but between the ends. In my experience, the wooden rooves are often a poor fit: warped, too thick at one end, etc. So I would look to see if another roof can be fettled to fit instead.
Also, the older models don't have scribed doors,etc, so look at doing that before you assemble and paint.
Re bogies,etc: you'll struggle to get 247 bogies, so I would look at Bachmann, Replica, Dapol bogies from b-sets, Collette, and others. Check whether you have the plastic windows frames and drop lights: I think you can get these from the current owners of the BSL range, Southern Coach Preservation Society or whatever they are called?