I had orginally planned to run dual rochestors on an Offenhauser manifold but after hearing and reading numerous comments from people that had them or have had them regarding how they were hard to adjust and how they ran I decided against them and sold my Offenhauser intake. So after some research I decided on the Weber 38 DGES, I'm glad I did. Compared to my single Rochestor its like night and day especially on the highway.