i have a 40 ply coupe and am putting a 68 chevelle frame underneath. the frame arch and the body arch dont match up and i need to lower the body 5-6 inches. the oem chevelle rear coil was 15 inches. im thinking a 11 in. coil plus body weight(around 500-550 lbs>
should give me the height i need. my question is spring rate. what pound spring should i buy. i want a nice smooth ride. this will be a daily driver for fun. thanks