Confused on which Alm Heads I need

I Just assembled an above deck 340 less than two weeks ago-you have two choices with LA heads...even if your pistons are above deck, you can get thicker head gaskets from cometic and run the closed chamber heads...if you want to run regular thickness gaskets, and your pistons are out of the deck, get the open chamber heads (60179).

Edit: we also the KB 243 pistons and they're out of the hole a good bit more than the assumed .018"...I'm pretty sure the machinist decked it below blueprint height, but that's why my brother went with the open chamber Eddys