Good luck, it's still a stock block with stock block shortcomings. Like most stock blocks, their blocks may or may not live long at those power levels. Some stock blocks do, some dont. Depends a lot on keeping the RPM low, the tune safe, and luck. If you want to make that sort of power, the wise move would be to start with a good aftermarket block and build from there.
BUT, i actually might take my chances with a DSS block level 20 block
my buddy has a, i wanna say level 10? 306 with about the same turbo kit ill be going with, with 433 to the wheels.
hopefully i get a "good" block from them