I bet it largely has to do with internal shapes withing the tank. I have seen "squared" tanks before.
So long at the internal baffleing is correct does it really matter what the outside of the tank looks like?
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"A ship in port is safe, but that's not what ships are built for."
See Bad Penny run the cones: https://www.youtube.com/watch?v=8GUPPIX-92U
1971 Chevelle Wagon - Roadster Shop Chassis ProCharged Shafiroff LS and lots of yada yada
1968 Camaro - Project Track Rat - 440 RHS LS
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