440 pistons Help

Howdy Howdy. Ok I just about got the block completly torn down. Ready to take to the machine shop. I ran across some rust in the pistons so I held off on buying any. But im sure there going to need atleast one to final hone the cylinders. I need piston suggestions please.

I need a piston that will give me about 9.5-10.5 comp in a 440 with a stock stroke. I imagine it will be atleast .030 over. Im using stealth heads there 84cc. Im looking for something on the cheaper side so TRW/Speed Pro is what Ive been looking at. Can be forged or Hypers. Ive looked at them but dont understand the compression math enought to know Im not buying the wrong ones. If someone could help me that would be great thanks.