Spring rate question...1961 Chevy truck

I put coilovers on the front end of my 1961 Chevy inline 6/ 3 speed last week. I had some old Pro shocks that had a pair of 400 springs on it so i started with that. I let the jack down and she hit the floor! So, i will need to order a set of springs. What rate spring would you run? Thanks

 

Just happened to see this the other day...

http://www.ridetech.com/info/spring-rate-calculator/

Google spring rate calculator, theres more out there.

 

Have you ever corner weighed the car? We also have a database form the cars we have weighed over the past 4 years if you want to use our spring rate calculator.