I had long headers on my 429. I didn't like them because of the possibility of scraping the pipes on bumps and they leaked some what at the collector on the passenger side. It took me a couple of months to find a pair of manifolds than would be correct. passenger side was no problem but the drivers side was a ***** to find. I did find a pair on Ebay and paid $1400 for them. got my muffler shop to put them on while removing the headers and hook up the exhaust system with new Flow Masters. Goog luck finding the correct drivers side manifold, they are rare.