i hope your not running a stock tubby cos to get 350bhp out of it will be a struggle!
if however your running a 3071 or similar then obviously you should be using an upgraded ECU so with the correct setup etc then you'll easily see over 350.
bear in mind that ive got a PowerFC, 3071, 800cc injectors and custom exhaust elbow BUT with a stock maf and stock engine internals and im able to get 379bhp at just over 1.3Bar (dyno proven). Sometimes its best to look at alternatives rather than just chuck on the Z32, whack up the boost because invariably the engine will say goodbye if you dont get everything setup accordingly!
Just for reference ive done a couple of track days so the engine has been driven hard and still standing!