Help With Carburetor selection, Please.

Honestly I am not sure What the gear ratio on this car right now is *Because i do not know the history of this car. I would imagine that the ratio would be stock therefore being *1st = 2.71 *2nd = 1.83 *3 = 1 to 1 *Reverse = 3.49

Currently the tire size is a 13in But that could change...
I was wondering if you could look at a manifold that I'm thinking about..
http://www.cliffordperformance.net/Merchant2/merchant.mvc?Screen=PROD&Store_Code=CP&Product_Code=45-4800&Category_Code=MY
This is a "Hyperpak" manifold that was originally built by Chrysler...
Here was the Chrysler set up...

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Could you give me any advice as to if these headers are anygood?..
http://www.cliffordperformance.net/Merchant2/merchant.mvc?Screen=PROD&Store_Code=CP&Product_Code=55-0010&Category_Code=MY

Once again!,
Thank you so much,
Corey