There are many options for the straight six including headers, 2 or 4 bbl carbs. 2 or 3 one bbl carbs. Hei ignition lots of things you can do to pep them up and or make them look nice.SWEET. so i have the non integrated. Now what to do with the Crazy manifold that has intake and exhaust in it with the 1 barrel. What kind of improvements are there for that piece of work?