I seem to remember vortec springs can only take .450 lift am I correct? I am going to change the intake and head gaskets on my 97 soon and I was thinking while I am that far why not put in a nice torquey cam and do some head work to it. The 2 cams I'm looking at are the comp cams XR252HR and the XR258HR. see specs here Both have like .470+ lift. Also anyone know what compression my 97 350 has?