Power limits for LA small blocks?

The procharger is not a way to big safe power. It's driven off the crank, and as YR said, the blocks flex, the crank will flex, and you create problems. Best bet would be a turbo setup. Less stress on the front of the crank and more power potential at the wheels from the same boost. More money, but you're saving from spending on a real block.
To be honest I'm going to go Gen3 Hemi deal for my next big power deal because of the lack of real blocks for a cost I can afford.