Need help deciding Spring-Rates

[Derek69SS]

'69 Chevelle (LT1/4L60) with approximately 2100 pounds on front and 1600 pounds on the rear with driver and full tank.

The car will see autocross/road-course action maybe 2-3 times/year, drag-strip 4-5 times/year, and I'll put about 4,000 miles on it each summer. I will drive it aggressively, but also do semi-frequent 100+ mile trips. I will be running QA1 adjustable shocks to adjust for different driving.

Front Suspension: stock spindles with tall upper & lower ball-joints, adjustable upper control arms with solid bushings, and stock lowers with delrin bushings. Adjustable shocks and 15/16" sway-bar (I have 15/16, 1-1/8, and 1-1/4... I'd prefer to run the small bar and have a little stiffer spring, but if I go too soft, I can fine-tune with the others)

Rear Suspension: Wolfe Racecraft spherical on all 8 ends, no sway-bar, adjustable shocks.
Lets hear it What do you suggest for my combo and how I'm going to use it