Caltrac Tuning Info LOOK HERE

Lotta good stuff on this, Im going with Caltracs on a 64 Barracuda. The car only weighs 2400 lbs, and hooked good with stock springs with small motor to run 7.09 in 1/8th mile (pulling wheels 8-10inches). Going to mild 408 and should run mid to high 6's, anyone got any advice if could keep my stock springs or should I get the mono's? Wondering if the light weight of my car would be fine with my current springs.