Unfortunately not, but I think there are enough info on the web to go by when calculating this. If I remember correctly there were two slight variations on the 320/319 case. For one of them you can order the bobbin case with the larger recess on the side, or alter an original case. For the other type I think there are ways bout it, but it required a different bobbin case or alteration. I'm can't look it up at the moment.
You will probably recieve first hand info on this because there are a few who have taken these two models ot heart and use it as their main machine.
Helen Howes' post is probably spot on when it comes to pushing the machine beyond its' limits, but it's still suppose to be quite a tough machine. Maybe keep a model 15 for the most experimental jobs like stitching through tin cans, mdf and just slightly too many layers of bull denim. My 201 is very well behaved as long as I can up the needle size sufficiently.