318 MAX fuel economy builds?

Your thinking is sound, I don't know if you'll see a major gain in mpg but definitely can't hurt if the choice is ported 920 vs stock j, with same flow but better velocity, i'd pick 920 to.
Thank you. I'm learning more about the quench and the KB raised dish pistons along with the closed chamber of the 920's puts me at .040 on the Diamond pistons calculator. I'm hoping this allows me to run 9.5 compression and reduce knocking allowing me to get more timing for better MPG. Time will tell.