SBE 318 basic rebuild +CAM , INTAKE, HEADS, expectations?

I'm in the middle of the same type build. What's with flipping the pistons?
Just a old school trick since the oem pistons are slightly offset you get a higher peak out of them they say due to angularity.
Idk if it's true or works
I put new bearings and rings in anyways so I just put them in accordingly.
See here