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Those look like they're coming along well!There is a way to get exactly what you want - make it yourself! In this case I used a cheap ebay stainless bbc header for a good head start. I cut each tube off an inch or so from the flange, and cut the tubes off at the collector with staggered lengths to make it easier to reconnect them. I tacked the collector to a plate and clamped it to the crossmember for a fixed target. Here is the modified left side header, tacked up with steel mig wire. Plug access is better and it's more compact than the header was originally. Yes it's ugly! I could have made longer continuous sections with my tubing bender, but I don't have the time or extra material to experiment with. My bender can only make shallow bends in thin material because it wants to kink.
I bought a 6 ft straight piece of 1-3/4 x .049 wall 304 stainless tubing from Mcmaster Carr, and a couple U bends from ebay. It turns out I didn't need the ebay u bends, as the original header bends were enough. I did use most of the straight piece. The tacks were sanded off and the tubes were tig welded with 308l stainless filler and nitrogen back-gassing. Argon is better but a lot more expensive, and nitrogen works fine. The last pic shows my back gas flow meter setup. The next task will be to weld each tube to the collector, which will probably be the hardest part.