Curt...I looked at your photos! great job! That is exactly what I want to do. What method did you use to weld up the manifold? I've heard that you can MIG weld the cast iron, but also that torch welding is a better weld but that involves preheating the parts. Relief of the welds is also necessary to prevent cracking with slow cooling. How did the steel weld up? How did you remove the cast under the exhaust elbow you added. thanks for pics.