Ah, gotcha. Sorry, I didn't see that mentioned previously.
I know how boost controllers work and can usually set them up pretty quick, but that model's unknown to me.
What's the present setting on the controller? The BOV isn't venting at all or you just don't hear it? Is the BOV routed to the intake or open to atmosphere?
EDIT: Well, if you're looking to learn here's a guide from our distant cousins the 3000GT crowd (*me* ducks the heavy objects now poised to be thrown in my direction). This looks like it covers things fairly in depth, although cut back on the boost settings until you have a feel for what the turbo has to offer before it chokes.
SwissCars / Blitz DSBC Installation
EDIT 2: Forgot to mention that you should also check that the SBC's vacuum line is connected and that there are no leaks.
here's the manual:
http://www.blitz-performance.com/inc...Spec%20S&R.pdf