/6 K-Frame vs. V8 K

So then the only difference in the K frame itself, 68-72, is the mounts? V8 is not beefier? Frames are of identical size/strength? Appreciate all of the insight from you guys. Just don't want to make the mistake of overloading a part that wasn't designed for the amount of power from a Big Block.

They are the same dimensions where they bolt to the frame rails.
340 K-frame is said to be beefier as shown above.
The /6, 273 and 318 are the structure with different mounts.
The only problem area is always the lower control arm mounts are welded. I would beef that area up no matter what.