Im planning on a complete performance engine rebuild built around gas mileage. Im hoping to squeeze 70mpg out of it. Then I will try and get with Toyota to retrofit a battery in it.

I believe the prius has a 20hp battery. This alone would drive a stripped geo metro. I'm also planning on plastic windows and CF.

Where can I buy light weight high compression pistons exc ???

?. What are you trying to do? Hybrid? 20hp battery? Am I the only one confused here?

^ I guess so :)

Does anyone know where I can get performance engine internals for the geo?

Try ebay, they have pretty good stuff for cheap a lot.

Try teamswift.net and get ahold of a guy named "Superfly" he has all kinds for cams and stuff fof the 1.0L.