Sounds like valvesprings and or dirty lifters to me. I really can't see the need for double springs on a hyd grind that mild but if that's what they spec then use 'em. Check the installed height of the springs to be sure they are within comps specs. If they aren't then the valves are floating and that's likely why you hear the noise. If the springs have been installed at the correct height then throw the lifters into the garbage and go buy new lifters from Ford. Make sure you clean them VERY WELL. What I mean is get a vacuum pump and a rubber hose with adapter large enough to slip over the lifter with a good seal. Dunk the lifters one by one in mineral spirits and start pumping until no more crap comes out of the lifter. You'll be surprised at what you see come out of them. This is the only way to be sure there is no trash in them. Manufacturers have gotten slack in quality control these days. I've gotten camshafts with fingerprints rusted into the lobes direct from the warehouses and lifters that I couldn't clean without disassembling them first.
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