okay, doing some research for blow through carbs for an a12 set up, the kb laser option seems do able with no change to the needle due to the increased boost being put through the a12. It may run a little rich, but better than running lean if you get my drift (bang!).It is off a 1.5lt engine so would be ideal for a a15, it produced 75kw in standard form with some mods it was limited to 90kw, by design limitations i believe. And only approx 500 made it to AUSTRALIA.
Who said they fit an a series inlet manifold with one more hole drilled in them? i would like some more info.
Another option would be from a gh sigma turbo, a 2.0 lt engine so maybe a bit big, but cant find enough info yet. But more sigma turbos than kb laser turbos running around.