340 pistons

Those are Speed Pro 7035P forged pistons. I would not run those on the street unless you want to buy racing gas.
The indy cast iron heads aka Indy LA-X heads are close chambers and would not work with these pistons.

As said they weight a ton, I have a set in a 340 that was cut down, still weighted a ton...
Compression height is going be around 1.82-1.84.
Actually ran a set in a 340 for many years on the drag strip until the STOCK connecting rod got tired of swing that heavy chunk of aluminum and broke.

340 MOPAR CHRYSLER DOME FORGED PISTONS L2322F STANDARD BORE SET OF 8 NOS | eBay

similar pistons for sale on ebay...shows the compression ratio with various head cc...