Lifter noise

This is scary as I have narrowed my cam choices down.
The leading contender at this point is the Lunati #638-60401LK.
454 X 475 lift @ 256 X 262 duration. I was going with matching
Lunati lifters, pushrods, springs retainers & keepers on stock 273
adjustable rocker assy. I would prefer to find a solid setup with
these #'s but they are either too big or too small. Anyone run this
setup? (not to hijack the thread8))
Rat