Need some info on swapping my one barrel Rochester out for a two barrel. I have a straight six 250. Will it mount on my manifold or will I need an adapter? If so, where can I find one? I've been thru three of the one barrels. I've rebuilt them before and they lasted a little while, and I've also bought the 3 rebuilt one. I'm having no luck. Will I have better luck with a two barrel or should I change mfgr? Afoot at this time. Need help.