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I have a carbed 302. I am putting out about 400hp. I have a 650 DP same as yours. When I upgraded to a single plane manifold, I had to upgrade to 72s in the front and 78s in the back. My car runs awsome!!!! I don't remember what the jetting was before, but it was MUCH leaner. A single plane manifold requires measurably richer jetting than a dual plane. Plus, you can get away with a smaller carb on a single plane than a dual plane since all 4 venturies can feed each cylinder vs only 2 venturies on a dual plane. But, as I indicated, the jetting must be richer.
I also have the K&N Stubstack on the carb which adds andother 28 CFM and smooths the airflow. I didn't notice much improvement at high rpm when I added it, but throttle response and mid range were noticably improved.
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Last edited by CobraEd; 10-18-2007 at 07:56 AM..
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