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I think it's possible but would require sacrificing the spare tire wheel well in the trunk. Remove the well and blank off the hole left in the trunk with flat sheet metal. This modification now allows space to slide the gas tank over towards the passenger side of the car. Sliding the tank over 2-3 inches might provide just enough space to run exhaust pipes between each side of the gas tank and the inner frame. The gas tank's filler neck would then have to be lengthened to reach the new location. A cut to the neck and a flexible fuel extension hose might do the trick. Thought I'd share the concept. I need to measure twice if not trice again before any cutting. Laying the spare tire on the floor of the trunk seems like a fair trade off in order to have full length dual exhausts on a BB.
I was able to get the last piece of tubing for this cylinder cut last night, and tack welded them together. I may have to buy some U-bends with a tighter radius for some of these cylinders. I’m planning on doing the one with the stub in it next.