What Rear Springs 63 Vette Roadster
 

Trying to get my new coil overs on the vette , put 110# on it and it seems to be to much can't get it to ride height without slacking the adjusters off about an 1 1/2" to where the springs are off the seats when cars jacked up and rear hanging loose. so springs are just hanging loose on the shocks. car is 2000# and probably only 48% on rear at most would be my guess(haven't scaled) and can you run the 2 1/2" springs on the afco shocks( afco sells 2 5/8") and car does not have adjustable shock mounts on rear.
thanks
Mike