Dumb question, cold starting...?

The cam was already broken in from another engine, I swapped the lifters and cam over together (and yes I put each lifter in its own labeled container to not mix them up). But great now we have two conflicting but equally reasonable takes on the starting issue lol...

I'm curious of something else, there seems to be a 'resonance' in the valvetrain when I'm cruising at a certain RPM, usually 2500-2700 that sounds like a lightly tapping lifter. Does this mean I have a lifter going bad? It only happens in that range, any faster or slower and it goes away. I noticed this too in my old 318 which I swapped the cam and lifters from.