Stock springs are fine for PI cams as they aren't too agressive of a cam. I installed PI cams myself - first time inside an engine btw. Just took my time using the long way to install by removing the front cover and accessories to get at the cams. The other method is to buy a cam removal tool from Ford. AFM also sells this tool, but have read that a few guys that have used it said that it's not as well designed as the Ford one. It's job is to relax the chain tensioners while keeping everything in place (keeps the engine in proper timing) so that you can remove the cam gear to take out the old cams and install new. Heads stay in place.