What would be a better choice for me? 4g63 or building the stock 6g72 that's in it? It's a 95 spirit

 

You will find much more aftermarket for the 4g63. Stuff a MIVEC turbo in it...

 

what cars besides the lancers and the eclipse (talon) came out with it

 

I don't know. Try googling it.

 

Throw a turbo on the 6g72 that's in it. They can handle around 300hp on stock fuel, stock internals, and stock ecu. Simple rising rate regulator and 6-8lbs of boost and go have fun. Can easily be done for right around $1500 if you do most of your own work.