This might help you, I don't know.
I am rebuilding a 383 right now. The pistons are some kind of forging, the only marking is an "80" on the underside of the crown.
Anyway, the compression height is pretty close to 1.781. Well guess what, if I use a 440 crank and the 383 rods, the pistons
will stick out of the deck about .034". With a composition gasket and 906 heads, I think I can bring it in around 9.5 ~~ 10.0 compression.
The pistons are a flattop with a small trough valve relief.
With the 3.38 crank the compression would be around 8.2.
Almost 440 inches in a low deck block.