Closed chambers gone bad… that’s a wrap

measure each piston at TDC with a bridge, you can even rock the piston while measuring. The older the build the bigger the rock. An uneven deck will get you in trouble as well. With those heavy pistons I would run a minimum .040 clearance to account for rod stretch at high rpm. I run a .060 thick gasket .020 above deck piston and spin to 6800 every pass.