Hopefully you have determined what heads and head gaskets were you planning to use, and approximately what static compression ratio that you are aiming for. There is some math involved. For example cometic has the .060 gaskets that could dramatically ( decompress ) change your numbers , when the .020 may bump your compression up and maybe allow the valve to just kiss the piston. I would ask the engine builder for the info about the pistons. I may be wrong but .125 in the hole seems like alot. There are some great engine builders on here and I am sure that they will chime in with some very useful info. Make sure that the gear drive is spot on, I sold a brand new unassembled stage 2 , everything was brand new, they had everything machined and installed a gear drive set up and somehow destroyed a twin turbo motor on a 7 second car. He claimed it was his set up on the gear drive . I have a motor with a Milidon gear drive ( I didnt set it up) and I have a motor with the chain, I would love to buy a Danny Bee belt driven setup for my new motor when I get to that point. Thanks very much for keeping us posted on your build.