So you have solid lifters and a cam for a Ford Focus and tried to use the SPL shim kit for it...or you're using a cam profile for a Ford Focus in your 300ZX?
"The 300ZX Turbo is a dance; it's a song; it's rolling, roaring automotive art. There is no color that doesn't suit it. There is no mood-lifting chemical substance it can't replace." - Automobile Magazine