I'm doing the same thing once I get the parts. I ordered 8 COP's(motorcraft DG515) and 8 spark plugs(motorcraft SP468) from autopartsexpress.com. I ordered them a few hours ago and it was 351.76 shipped. Also, I think LS's made before July 16, 2001 used spark plug #SP467. After that date, they switched to SP468.