one more rookie question...

Sounds like the listed weight of my /6 Duster. A bit light. I'll go with 3200 empty with the aluminum intake and headers as replacements to the OE iron material. Better to assume heavier than lighter. It would work out in your favor this way right or wrong about the weight.

SO!
You want to end up with 3.55's?
And ;
What size tire?
What type of performance?
In example, pure street, street strip, etc.......The gear ratio is a little dictating on this.
(RPM performance range would be good to know. If you have an idea. No biggie if you don't.)