3" exhaust w/ relocated springs ?

I think I'd just section a stock new one and weld it up. Taking some out of the width should help

yup, thats exactly what why dad did on his minitubbed and inboarded 69 dart...its the passenger side of the tank that is offset and creates the problem, so he chopped it up and made it less wide on that side and voila! looks good too! me, im doing 3 inch as well but i got lazy and love noise so im dumping it under the car lol

good luck!