The best solution for the cast iron to aluminum piston relies on baking and Cerakoating the top of the piston, Honeing the cylinder with a bit (not the cheap ones with extended arms). The one which has all the little dingle berries on the ends and a good amount of tapping greese or motor oil. Build Break Fix It ceracoated his piston head and ran into zero seizing issues. Otherwise you're going to play this game of taking 1 minute cooldowns. The piston and the rings expand a tad larger due to the heat and expansion differences. Using a Athena head and piston makes a world of a difference, all across the board. Simply because they're also aluminum to aluminum.
Keep in mind build break and fix it claimed using a certain china girl piston other than the oem stock STD piston then ceracoating it fixed all issues on the original cast iron cylinder.
I know a lot of people discredit this guy, etc. But he has some pretty detailed videos which i do appreciate. If you're looking to save loads of money then try this first:
View: https://www.youtube.com/watch?v=ZL_MTOeetSc