Nearly impossible to tell without seeing it. The fun thing about rust is there's almost always more of it than what you can easily see. Pretty common for trunk floors to rust, and also common to replace them with reproduction trunk floors.

 

it’s hard to see on the dash and i’m still waiting for more photos from the owner. but that was my worry- i don’t want to be surprised later!

 

The trunk floor is pretty typical. Not too tough for someone who knows how to weld sheet metal. The dash/cowl is likely going to be more of a challenge, and I'd venture to guess there's more rust than what you can see.

Unless this '67 is especially desirable to you for some reason I would likely keep looking, and certainly if you will need to have someone else do the work.

 

Rust under the Windshield and on the Dash is a common problem with these cars. But good advice above:

"Unless this '67 is especially desirable to you for some reason I would likely keep looking".

 

My 65s trunk looks about as bad as yours. I'm just going to replace it with the repro trunk pan, as someone else mentioned. They aren't terrible expensive. I found the one for my 65 on classic industries for $900, or $1500 if you want it to come with weld thru primer coated. I was expecting much higher prices. edit: the dash may be trickier, if the 67 is like the 65, with the dash being a part of the frame of the car.

 

That trunk rust would not bother me in the slightest from what I can see. The wheel well bottoms look to be okay.

That front dash does worry me though and I fear it may also be further down towards the rocker panel corner as well.