The way to use those heads is a custom piston that comes out of the deck enough to make squish.

When you start looking around at the shelf stock pistons and their prices, the additional cost to get what you truly desire isn't so big.

By using an aftermarket rod and custom lightweight forged piston you can take about 300grams off every unit, 2400 grams total. That's 5.28 lb!
Think of how that would wake up the engine.

To correct an earlier post, the stock 340 piston weighed 720 grams with a hefty pin added to that. It was internally balanced, no heavy metal needed. So, it stands to reason that one could use a stock replacement piston or anything lighter without adding heavy metal

R.