452 Head question

Looking for some advice, been trying to research it but can't find much, thought someone could help.

I recently started a 440 build, got everything tore down, cleaned up, and got to looking at my heads. I've got a set of 452 heads they looked great but one has a crack, no problem looking for another 452. Found a member with one, then notice these heads have a single spring w/ damper on the int. side. Also worth noting each spring with a damper had cracked seals.

My question is was this normal or were these heads cut to fit these and could I find another bare head and use my existing hardware on it?

What kind of springs are these? I can see a some green paint on the ones with a damper if that means anything.