Need some advice with my piston swap.

I'm running KB 107s in my 360, good pistons, engine runs really nicely. But I had to ring it twice! the first time I didn't quite follow KB's instructions closely enough and gapped the top ring too tight. After the short block was together I realized my mistake and had to take it apart again. Min for me was 26 thou, I gapped to 28 just to be safe. They are good pistons but you have to really follow the instructions!