67 Barracuda Big Block K frame keep it or change it ??

I think the only thing mopar did differently on the performance K frames was fully weld the tubes in that hold the LCA pins, then tack weld a washer to the k frame to denote it as such to assembly line people.

That's a 340 K member thing. Based on everything I've seen here, it was primarily done on 70+ 340 K frames. Only a few K frames with washers and reinforcements have shown up pre-'70. And the big block K's I've seen haven't had them. Which make sense, because if they didn't do it pre-'70 they didn't do it for the factory big block K's

The 340 ID washer
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And the LCA pivot tube reinforcements. They were not fully welded on both sides, just this reinforcement was added
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Best thread here on the 340 K's 340 K Member ??

I figured they were the same part except for the mounts. If he is trying to keep it somewhat stock as he originally mentioned because it is a 383S car. He mentioned just wanting the borgeson box and mentioned his dented K frame before seeing the QA1 K. I'd recommend to just make a 67 Slanty K into a big block one, this way it kinda keeps its pedigree or a 68-72 one into a big block one for the better idler arm mount.

Yeah it would be way easier just to use a stud welder and a slide hammer to pull the bottom of the K frame out.

Or, add the optional skid plate. It covers the dented area and keeps everything from caving in when you use the K as a jack point.

Firm Feel sells their whole K frame reinforcing kit, which includes a skid plate.
Firmfeel Mopar Suspension and Steering

Or buy a reproduction one. They're correct for B/E bodies but they fit A body K's as well...
Mopar Reproduction Skid Plate for B/E Bodies