Have some questions about stock full rules and springs. I have a rule book and have done a lots of searching but am still unsure about some things. First, can the coil springs on a late model Chevy be replaced with coil over shocks? Also, can the rear leaf springs be replaced with leaf springs that provide a lift that is different from the stock springs?(for example deavers with a 2" or 4" lift). Thanks for any help.