79 T-Bird best gear ratio

Have 78 diamond jubilee Put on edelbrock 4 barrel manifold and electronic dist.Was thinking of 3.25 rear gear ratio any recommendations.All emission off and dual exhaust added
 

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As regards the C4 vs. the C6 transmission, their gear ratios are exactly the same.

http://www.hcdmag.com/c6-transmission/

Fom that page: The 3 gears selected for the C6 are identical to the gear set for the C4, with 2.46 for 1st, 1.46 for 2nd, 1 for 3rd and a reverse gear ratio of 2.18.

Also from that page: the C6 was designed to accommodate more torque and power than the C4, and generally to be used in the larger engine applications.
 
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