Tom,

You definetly want to get the car on some scales as a starting point. You will want to get all the wheel weights, cross weights, and roll couple etc. figured out to tell you were you are at currently. Once you know that, then you can see where you need to go.

When it comes down to purchasing the leaf springs, there are a few decent off the shelf, decent priced, performance options available from places like Afco, Landrum, and Speedway motors. You can look at some general weight breaks for various sizes in multi or mono leaf set up and spend around $150-200 per spring. these will all get you close to what you want to get a good set up.

If you truly want to get a custom made leaf designed for performance and aren't worried about cost; there is a guy on the Pro-Touring board who knows more about leaf springs than anyone I have ever read. He is a formally trained engineer and trained under Dick Guldstrand for many years back in the hey day of trans am racing. First you have to register on http://www.pro-touring.com/ to gain access to the members list. Then look up member chicane67 and send him a PM. He does build custom leafs springs but does not advertise. Expect to spend between $500 to $1000 per spring, but these will be the best set of leaf springs you will ever see. The choices and options of main leafs and secondary leafs will amaze you.