The head pipe part numbers are for the factory 68-70 340 hi performance exhaust manifolds driver casting #2863553 (EB25LE) and passenger casting #2863549 (A25RE). The pair of 2.5" head pipes are listed for $193.00 for the moment. Just wondering about the fit of this particular TTI product and how they worked out for you. Thank you. The foto below is obviously not of the head pipes I am talking about, but shows the exhaust manifolds I purchased with the above casting numbers.