For what you'd spend in adapting the 16V head to work with your B230 bottom end, you could just as easily do some work with the 8V head (or get a hi-po 8V head) without the added frustration. A well-done 8V head/cam/headers can give comparable power levels as the 16V (~150 HP), and then you've still got all kinds of stuff you can do (more radical cam, bigger valves, stroker kit, turbocharging, etc... Note that for HP levels over 160 you MUST modify the fuel system) The 16V head is kind of a dead-end - since it saw such limited production, the aftermarket did not embrace it. For instance, I only know of one or two sets of hi-po cams for the 16V head. The 8V head has probably 30+ cam grinds, wide valve size selection, headers, and several aftermarket tuners who have solid experience developing these motors.
There was a 16V head developed for the B21 (the Volvo R-Sport 16V head). This was a pure-race unit that was purported to put out well over 200HP when bolted on. I'd like to get my hands on one of those...