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Definatly use a dual plane manifold with a vacume secondary carb. If you do the math, you'll find that the 600 cfm carb is probably a little much for a 289 street car. If the Edelbrock is a vacume secondary, go with that. You'll lose a little top end power with that combination, but you'll gain throttle response. And the improved vacume signal will help the auto to shift better.

On a side note, you might want to consider dumping that C6 for a C4. The C6 is big and heavy and takes a lot of power to turn. Your 289 will never make enough power to lunch a C4. You can sell the C6 to someone who really needs it and come out even (or better).

Of course, there's always the AOD.........
 
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