Agreed. I'm finishing up a Silv-O-Lite equipped 340 today; and with .03 off the heads, .005 above deck and thin head gaskets its working out to be 9.8:1. The last time I built a 340 was 30 years ago and the sealed power forged were available.
The other issue with the Silv-O-Lite pistons is the radial valve clearance of the intake valve relief. It has been cast for 1:88 intake valve relief. I mocked up the engine with a set of EQ 318B heads, 1.92 intake valve and it made contact with the radius of the valve relief...