Chris give faulkner springs a call http://www.dfaulknersprings.com/ give them the spring lengh and diameter id go for 225lb rear progressive to 350 so harder the squat the poundage increase and front 350 progressed to 450 or near as dam it this will firm it up but not to much but under hard driving it wont wollow about ,

Glad your getting to use the car mate looks sweet as