"sitting" you dont mean sitting as in not being driven do you? I would think they would need to occillatations/flexing produced from being driven to make em settle as opposed to just having weight on them. What about some lowering blocks? My 65 dart roller came with 003/003 SS springs & I needed shock extensions but the height was perfect & it rode very very nice. OP the P prefix denotes a MP performance part which would not be an OE spring if I am reading your question correctly