These are great tips! Your headers look awesome!!! For these logs, I just ended up using my bench vise to squeeze the tube one way, and a big pair of vise grip clamps to square it up the other way. Then a big punch and hammer to make adjustments. It turned out working pretty well.
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Since I wasn't sure whether to weld the inside or the outside, I did both just to be safe., then ran a flat file over it to ensure the flange was perfectly flat. I just wish I had a good friend who was a good tig welder. Hopefully everything seals.
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Lastly - don't ever buy j-bends from Hooker. I couldn't believe how rusty these were on the inside.
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