I have a few lifters making noise until well warmed up

Sounds almost like the lifters are leaking down oil on some (when setting up on the cam lobes). Not sure if it applies to this engine, but are you using an oil filter with an anti-drainback valve? Some lifters will lose oil more easily and be noisier if the oil drains completely away from the lifter gallery.

And, it could just be the individual lifters getting 'leaky', if some gum or dirt gets in the check valves. My son's 4.7l lifters rattled like crazy for a coupla mintues at startup. We just re-did the heads for a head gakset leak and put in all new hydraulic lash adjusters and it is now quiet at startup. DId the same for a couple fo Misu 2.6L engines and for my wife's old 3.5L V6...same issue: worn/gummed/dirty hydraulic check valves.

Some times you can find this by just pulling the lifters and putting them in a can of fresh oiol and pumping each with a pushrod. Good check valves will pump up hard in a few strokes; a lifter with a bad check valve will not pump up hard if it is really bad...but you won't find all of them this way.

Funny Pishta mentioned a 302....mine did the same!