340 High Compression Pistons

forged are you thinking spray? boat, motorhome, truck, sprint car, blower
for most everythhing hypers work fine
whatever
find a combo with tight quench that gives the cr you are looking for for the fuel you have available
was it this thread that showed a circular dish?
and I said send them back
a circular dish can work with a wedge head with good fuel and higher rpm-higher compression they can make the same HP
for a usual street build a D-Dish or a Dish that matches the combustion chamber works better, more fuel tolerant and will show more torque , less advance and work better with lower compression
On our high boost engine we had too much squish area and cut it back to a larger shallower dish but that is not usually the case