I did not mention the the dings on the front crossmember as I have not seen a "B" that did not have them as that is the standard location to lift the car using a trolley jack. The main reason is that jacking from the original jacking point on an old B is that the sill could colapse.

Beam up the pics of a pals B that we restored to give you an idea of what may lie behind a reasonably shiney sill... scared
https://www.tm-img.com/image/t9flv
https://www.tm-img.com/image/t91ZS