Correct Exhaust System

I recently purchased and installed a Waldron exhaust on my 66 Barracuda. It is the non HiPo. Excluding the Y-pipe, I am satisfied, it fit well. While the Y-pipe was bent near identical it differed in the header flanges. The original had formed flanges, the new one 1/4" steel. I was going to need longer bolts, so I kept the original for more miles, and will change out later.