Importing .uc files

Is there an option to import Unreal Script files (made in UE 3) to UE 4, or is there any tool that can convert .uc files into something I can import to UE 4?

Nope, UE3 and UE4 are too different anyway, that would not make any sense. For example, SkeletalMeshComponent do not have the same methods/properties, same with pretty much everything else. In UE4 it’s all about C++ if you want to code, or Blueprint if you prefer visual scripting.