coil without ballst resistor?

Since you are mismatching components, that might be a difficult task. The DC resistance has little to do with the coil performance, especially with more modern coils which use better core material and so on.

Frankly, without someone rounding up a bunch of coils and testing them, I'm not sure anyone can guarantee you an answer

Wonder if the cylindrical shaped coils from petronix or any of the performance companies would have the same power? Did any of the later mopars use a round coil that had the power of the GM coils? I do want to get the coil that looks more original but doesnt use a ballast, but also want to be able to have the output that the GM coil has