Need advice for springs

[kball]

I'm trying to get my chevelle dialed in. Here's where i'm at. Don't have access to corner scales, but it's a 71, all aluminum LS, tremec tko, pin on glass hood, which i'll be changing back to a hinged steel hood eventually. Car weighed in at 3440. Right now it's just got random springs that I cut down so I could move the car around.

I'm kind of confused because most coilovers seem to be 450-650lb/in, and then there's afco stock style springs that go over 1200lb/in.

The car is a street car that gets driven hard and will do occasional track road course days. Right now i've got Bilstein shocks and can keep them, or make way for coilovers. Don't really have the budget right now for top shelf stuff like ridetech, but looking at QA1 and viking coilovers, or just keeping the bilstein shocks I already have and buying a set of springs.