help with spring rates

[skeevay]

I am trying to determine what rate springs to order for my 65 impala. I have done some research/estimating/guessing and come up with some numbers. I was hoping I could get some input from some of you with experience in this department.

I am guesstimating the total weight of the car to be 3900 lbs. 57%/front 43%/rear. Lt1 w/ alum. heads....T-56 trans. 4th gen camaro front suspension using coil overs. Motion ratio= .4 (13.75" lower A-arm/ 8.75" A-arm pivot to lower shock pivot) Shock angle of about 12 deg. 1 1/4" front sway bar. Rear suspension is truck arm with coil overs in factory spring location (on top of trailing arms ahead of axle housing). No rear sway bar. This car will be used mostly on the street and for road trips occassionally so a decent ride quality is desirable, although I do like the firm "sports car" feel.



700 lbs. in front/ 225 lbs. in. rear......? What do you guys think?