Which head should I use?

Which head should I use?
Posted in
Custom WorkstationI want to make a Bill the Lab Guy figure as part of my Action League Now set (well, the one I'm still working on). I know how to make the body and everything, but what I'm stuck on is the head:
What head should I use? Did they use something off-the-shelf, or did they just sculpt it themselves?

Please wait...
User Comments
Marvel on eBay
What's that Mego head? It looks like Bill! What is Mego?
As a last resort I might get this repro Mego head and make modifications on it:
These are screengrabs from a primarily Bill-centered episode I found online:
need more info than that pic.