Hey everyone I am building a 351 cleveland with 4v closed chamber heads. I had some flat top pistons on my first build and now want to try pop up pistons to raise the compression to around 12.5. I have heard that if you run a big enough cam and your dynamic compression is below 8:1, you can run pump gas. The cam has an intake closing ABDC of 80 degrees. With the calculators online it tells me it will be close to a 7:1 dynamic compression, and in theory will be able to run off atleast pump 93. Im in Alabama so elevation is basically sea level. Ill be running megasquirt fuel injection and EDIS. Does anyone have any experience in dynamic compression?