spring rates for the rear end on coil overs

[wheatlandbrawler]

hey guys i have fabbed up a suspension set up and i have a set of coil overs on the rear i currently run a 100lb spring rate (100lbs to move 1 inch,) with it being a swb and ive done exstensive removal and tubing so it should be pretty light do you think its an acceptable spring rate or should i change it. ive noticed not very many people on here are interested in going fast but any input would be greatly appreciated thanks guys.