Which One Should I Get?

[A//// Guy]

The pistons are prolly just fine... Rings on the other hand are worn and the valve seals in the head are gong to be leaky. Thats wy compression is low....
If you do a rebuild you need all the gaskets and all that so just asking how much pistons and rings are tells me you shouldnt be rebuilding anything unless you find alot more about how these engines work and where to get parts. Call a local parts store on prices for rings... that would be a start. But first Id get a decent car and figure out what you want to do with it.