Here is a good rule of thumb equation for calculating how boost will effect things such as the stock normally asperated (SNA) compression ratio and power.

Boosted-Value = (Boost+14.7) * Flow Efficiency * SNA-Value / 14.7

Flow efficiency will vary depending on such things as cams, valves per cylinder. intercooler, plumbing, etc but a good rule of thump to start with is 0.8 (80% efficiency).

When it comes to compression ratios there is only so high you can go before a usable mixture will spontaneously combust creating detonation issues (which in a highly compressed motor will usually result in destroyed pistons and related problems). You will usually never want to go over an adjusted 13/1 compression ratio. This is the reason why a turbo or blower on a car with 10/1 compression should not be set to more than 8-10 PSI.

When it comes to power an engine is usually designed with a 4/1 safety factor. This means that an engine designed to put out 150 will usually self destruct if it ever has enough fuel and air crammed into it to produce around 600. You can usually safely double the power output of your engine and still get a reasonable amount of lifetime out of the motor assuming you don't overheat or overstress any critical components.

Assuming your compression is low enough to go this high, the power doubling boost is between 20 and 22 PSI depending on your engines flow efficiency.

You can sit around with a calulator and play with this for a while so you can see what your current limits are, and when you rebuild the engine how low you might want to set your base compression since that is usually the critical factor that will determine how much boost you can run and how much power it will get you.