1.93 compression height
9.98 deck height
6.387 rod
3.387 stroke -1/2 is 1.69
9.98 - 6.387 - 1.69 = 1.89 so .042 above deck
I think you meant BELOW ???? ... that's even above the bloated NHRA spec of .021 above the deck , there wasn't a 383 built for production passenger cars or trucks with a positive deck height piston .
Some of your specs are incorrect , stroke for the 383 is 3.375 , 400 is 3.38
68-69 383 HP and 2bbl with a dish pistons are 1.932 , on a blueprint deck these pistons sit .0025 in the hole , that's the tallest B 383 CH piston.
