Domains previously used as a PBN question

hey guys

I found 3 decent domains with great backlinks in my niche
the problem is, i notice in archive that they were used previously
as a PBN.

Anyway are these domains worth to buy?

I need them only for a one time event promotion
to rank them fast and then forget it.

I don't see them in google when i type site:url as they are a bit old.

Is there any way i can get them indexed again if they were penalized?

If it has been used in PBN and there might be a risk that the domain is penalized by Google. if the metrics worth trying give a shot. Buy it and add some article and see whether site get indexed. If so scale it up with more articles and point to your site.

Forget bout this domains, as mentioned chances are 99% that they are penalized!

For me it depends on what the stats of the domains are like. If the stats are good it would be possible and probably easy to get around the assumed ban, remember it is just assumed. It is not rare for a domain that has been down for a long time to no longer be indexed.

And what about to add these domains to google webmaster tools
and contact google to inform them that i am a new owner od these domains
and ask for indexing them again?