forgot to mention one thing, you probably don't have knock control and if you use a standard distributor with vacuum advance IT WILL DETONATE the pistons above 6PSI, I was able to get a vac advance /retard module for mine which worked a treat, the dodgy way is to lock your mechanical advance weights so it can't advance the timing with engine speed, that way it advances timing before boost and when it hits boost it will retard back to your original setting.
Another carby that works with boost is a Weber 34/34ADM, you got them off the old ford XF falcons. they have a boost enrichment circuit and a sealed float chamber which other carbys don't have, this is crucial for push through turbo.
damn completely forgot about the advance! thanks heaps for that. Got a mate who's trashing an XF might have a look at his carbie.