Bent Frame, bent k member

So for years of owning my 68 Valiant, I've known it has a bent frame. Finally got it in to a body shop to get it all squared up and got a call today, they told me the k member is bent, too. Basically the conclusion is that the k member isn't fixable and that it likely won't bolt in place after the frame is bent straight. Now I need to source a k member to replace it.
A quick search on the ole marketplace showed only a super cut up 73+. I know wildcat Mopar is somewhat in my region, but haven't called to see what they price theirs at. I'd like a /6 unit because I've already got the adapter motor mounts for my 318.
My other option is going tubular and I don't know exactly where to start there. If I'm going tube I'd like to keep the torsion bar, which could be just contained on the lower control arm, right?
Any thoughts on this/where to locate parts?