Hi Stewart, I'm not sure if the 67 383 AFB has the weights in the rear or not. I have flowed the one without the weights and it was 565 cfm. The AVS is 635 and the 70 Holley is 645. These are clean stock carbs I had laying around, The numbers are rounded to the nearest 5. If the intake will be custom made the Stage V head which is similar to the 346 and 452 would be the best bet. If you use a store bought mani the 906 head can be an advantage. I would stay away from the 67. Paul.
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