Magnum 5.9 piston crown thickness

Mmagnum engines have a quench pad on the heads. To determine detonation, it is best to keep piston to head clearance down to 0.040" or even 0.035", depending on con rod construction, piston compression height, and how high you intend to rev the engine.
Quench or in Europe, squish, promotes mixture motion, which aids a quick and efficient burn. With that in mind, view David Vizard Powertec 10 videos Ep 148 to 150. He also discusses piston porting in his Chevy Big Block, Max Performance on a Budget book.
I think I would be looking for pistons to zero deck it. DV builds many engines with the pistons 0.005" proud of the deck.