John,
If you put all new lifters in I would go with Lunati. The link bar setup is a ton better than the Comps. I have had bad luck with their lifters. The Ferara valves are nice, that is what I put in about all my builds. Inspect the cam bearings as well to make sure you don't have one spinning with the cam it will cause a valve to tighten as well. Good luck with it. poppaj