I am the second owner of a '73 Z. It has been running good but there's been some fuel cutout at speed. I started to do a full tune up, and when I pulled my plugs I noticed that one carb bank (the front 3 cylinders) was running rich while the other was running lean. So I went to adjust my throttle opener adjusting screws and found that it was zip tied to the throttle shaft. Why? This is the front carb fyi. So I went to researching su carbs and possible mods, only to become more and more confused by my current carburetor configuration. The more I look at it the more different from anyting I found it becomes. For example the EGR control valve doesn't look like a block off plate or the stock EGR control valve. I do know that he did an engine bay clean up, and got rid of the 73 square body carbs. Can anyone tell me what mod/mods the previous owner did that would explain this?
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