You've got me going now!
Below is a 395 bellhousing with two scallops to clear the crown wheel.
In the other photo note the crown wheel protruding from the face of the box.
So I am guessing in the photo where you are holding a flat R16 bellhousing up to the alleged 395 box, it won't fit because the crown wheel is too big.....
Still working on the other 5 speed , but i assume it is a 365.
Cheers
Richard Mann