3 unidentified engines need help

[propclock]

My friend Dwight Giles has several cast iron blocks that are obvious 2 stroke airplane ? engines .
They are beautiful castings and look like were made for ~ .875" bore. Does anyone recognize these engines?
The third question is I recently had the pleasure of bringing an engine back to life.
It is large the flywheels are ~12 " in diameter and weighs about 50 lbs. It is labeled a Challenger.
I don't remember seeing these casting before. , Beautiful engine,
Here is a poor vid if allowed