For this, I slapped a wider base on in Meshmixer and tilted the head back just a bit as the overall overhang causes balance issues.

There is still an issue of how the skull was put on the model as there are gaps between the head of David and the skull internally which end up getting printed and waste a lot of time anf filament. Printing with more base layers will probably fix the balance issues caused by this. I wouldn't print this large because of that gap. 

All credit to the creators of this now multimixed centuries old project.