building a 383 Stroker with Factory parts help needed

Get the block decked and measured BEFORE you buy gaskets or pistons. The last three 400 blocks I've had cleaned up square at 9.960, 9.965 and 9.965. With a steel rod, I'd expect a .035 or .040 gasket to be the right setup once everything is machined, but it all depends on the measurements. S/F....Ken M