What's wrong with this picture Part 2, but much more serious this time.

thats a feature they all have... eventually
the 50s cars and truck with similar set up also suffer.

car designed to last 10 years max and we are 50 years on...

that chassis rail has a zig zag of steel inside
and it has through hole strengtheing tube inside

a flat steel jig can help with repair use your steering box mounting ears as the template for your template...:)

this welded in structure blocks drainage of any water going into the rail
it also means that the drivers side rail is very stiff in this area and bendy towards the front
and the other rail is just plain bendy all the way along

so you get a concentration of fatigue and corrosion just before the steering box mount

suggest its rebuilt with a drain hole either side of the mount
standard repair section for A body can be used.

but you need to weld in the strengtheing i.e some round tube or whatever
so the steering box bolt doesn't crush the rail.

i made mine from filing cabinet but these days repair pressings are available.

do it once and its good for another 50 years

Dave