The original welds on my k frame look like some pot smoking hippy in the 60s welded it up. And mine is sloppy requiring shims between mounts to get the headers to fit. Back in the 80s I ran Hooker Headers, didn't know about sloppy k-frames, and beat big dents in them to fit. Then the internet got invented and learned engine placement in a lot of these cars can be a major problem.