Dart/Barracuda Big block 383 manifolds. 67 vs 68-69 and Exhaust systems

I believe that the '67 left side has a different exit angle than the '68-9. I bought the accurate system. They are expensive but it was important to me that it be "correct" and high quality. They required L&R manifold casting numbers before ordering because of the differences in the years. They have collected NOS pieces from which they have patterned their production. Am very happy with mine.