340 Piston to valve clearance w/RHS heads

On my 410 the pistons stuck out of the hole .016-.018 Just like yours. I am using RHS Heads from Brian at IMM. I have all forged internals with H Beam Rods. I used the SD Felpro gaskets that are .054 Compressed, 4.172 Bore. The reason I used the Felpro 519SD is I was gunna hit it with some NOS and at the time Cometic did not make gaskets for the RHS Heads. Now they do!

Quench was about .036. I have bounced this engine off 7200 RPM a few times. I usually shift it at 6500. Rev Chip is set at 6800 Rpm

The Fire Ring is a little wider on the SD gaskets. FYI