I want to run duals out the back of my 52 hudson wasp 262 6 cylinder, I think its Fenton that sells them ,if you get the Fenton s you would still have to block off the bottom of the carb , right? Or would you be better off to make your own headers? 
Otherwise there's a video here where the guy splits the manifold by welding a plate inside and a extra outlet on the bottom.
Or I could run a Y pipe at the front but , I think it would not sound the same, any thoughts or suggestions would be appreciated. Would I better to run a H pipe or X pipe or just leave it straight?