If you have a vacuum gauge run a line inside your cab and watch it while you drive. I believe the stock Edelbrock spring starts to lift the rods around 6hg. You may find out in the end that you need to change rods jets and springs. Thicker mertering rods is as good as any place to start. Just take your time and make sure you only do one change at a time. If it gets better then keep tunning in that direction. That way you won't get too confused. Even when used on the V-8's they are designed for most carbs are almost never perfect right out of the box.
