A new exhaust manifold is needed. So now is the time to ponder new intake,exhaust and carborator combinations. I'm intrested in fuel economy for an around town 54 1/2 Chevy 235. It is my understanding some modifications in this area will help. What works? And how important is the heat box arrangment? Duel exhaust means what else do Ihave to think about? Is there such a thing as duel exhaust with heat box? How does water heat work,and is anyheat source really needed above and beyond the manual choke? Initially duel singles intuetivly make sence. Is this better Than stock manifolds with single duel? Just g3et me started here,and thanks.
