Here's my 2 cents. Ditch the integral head, regardless. To get to 200-250, rework the engine instead of turbocharging. A budget would be helpful to know what you are doing. I love turbos, but if you are only trying to get 200-250, a turbo would be a lot of money/work. A good head, cam, headers, intake, and carb will have you seeing 200-250 pretty easily.
