Frame repair Q's

[B_to_C]

Backstory: I picked up a 79 1-ton truck because I had done this

And this

to my K5 frame.

So I took out the motor of the 79 and found this

first notice the notch in the left side of the picture. After I scrubbed off some more dirt I found out this notch travels about .5" into that bottom frame rail. It looks like something cut it, not like my twisted frame created cracks on my K5 frame.

to the right in the photo you see a nice jagged edge where frame has been cut out. -the going theory is someone cut out the old exhaust at some point and got into the frame without realizing it.

How should I repair these sections? SHOULD I repair these sections? is this not a high enough stress area on the frame to worry about or...?

 

[mrk5]

For more reference, the engine crossmember would be about 3" to the left of the notch in that picture. The jagged crap is towards the rear of the truck.

 

[B_to_C]

Ttt

 

[Jimbo*]

Which frame do you want to repair? The one with the crack at the crossmember needs to be repaired. The other frame damage isn't bad enough to worry about, unless there's a bunch of rust/scale under the grease. The damage to the '79 frame isn't in a high flex/stress area.
Jimbo