You don't really need to know the weight, as the ride height is adjustable anyway...
Choosing a spring rate depends on what you want to do with it, and how low you want it to sit... a lower car needs stiffer springs to keep it off the bumpstops during normal driving.
Drag racers like soft springs for better weight transfer. some run ~200lb
Road-racers like really stiff springs to reduce aero-lift and braking dive. some run ~1000lb
For the street, you want to be somewhere in between. Stock bigblock cars were around 350-380lb, but for improved handling, a lot of spring kits (Hotchkis, Eibach, SPC, etc) are around 500-550lb.
I run 700lb springs in mine, but my car is VERY low and I do a lot of autocrossing...
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Derek Kiefer, member of Minnesota's Northstar Chevelle Club
69 Malibu Pro-Touring - 69 SS396 3spd - 23 Model T roadster pickup
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