Don't worry about getting them perfect by priming them when setting them, use the up and down method cold to determine absolute( + or minus .002 ) zero lash and then add 1/4 to 1/3 turn preload
Mopar had some issues with all their hi Po cam kit hydraulic lifters clattering intermittingly for several years, my wife old 1973 318 motor with the Mopar 1968 340 automatic replacement cam would have one or two lifters collapse when sitting overnight sometimes and then pump up and be good for several more days and then do it again until it had around 5000 miles on that motor