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TERRY
Since you have a slip fit system to begin with, your headers should be at least 3/4 inch or more longer than you would need to use flanges anyway. So cut the end of the sidepipes off what ever you can spare, use the so called pieces (bushings) to slide over the header tubes to make a good fit in the flanges, that way you don't have to engineer something to work. If you can cut the pieces close to the thickness of the flange material you can hide the offsets with the weld bead. Just make sure you weld the insides up on the flanges for insurance, strength, and a good seal. Don't get carried away on cutting the sidepipes, to do a nice job the bushings don't need to be over 3/8 or less depending on the flange thickness.
DON
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