Just had my 455 decked earlier in the year. With DSS pistons, to achieve proper quench it was decked at 10.213.
4.21" stroke
6.625" rod
1.48" CH
10.21 for a piston that is in the hole .003 in the hole with a .041 gasket to achieve .044 quench distance
DSS part number 6120B-4190
My machinist did not indicate how much material they had to take off the deck, but I didn't gather it was a lot.
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-Jason
1969 Pontiac Firebird
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