Thanks for the answer to the original question and all the pics... nice looking work on all of them.

The challenge I am faced with though is that I want to run mufflers and turn the exhaust out to the side, but this is a back-halfed car. I have to either go under the 2x3 crossmember
or out the sides, so I am trying to keep the frame rails that run from front to back as high as possible.

If I go with 2x3 tubing from the 2x3 X member to the front near the torsion bars, I will probably have to lay the 2x3 "flat" rather that "tall" if you know what I mean, so I have that extra ground cleaance. Only other options I can think of to keep them high is to run them inside the car (which I am not crazy about), or use smaller tubing.

I have to give up something one way or another. I guess there is oval exhaust tubing too, but never worked with it.