Most people run them stock.

Andy has some bored ones but I dont think hes ever run them.

Mine produces best power on stock shape/sized carbs even though I've run it on PJ38's and PWK39's. The stock carb is hard to beat.

If you want to mod them clean the bell mouth side up a little and fill the air corrector cut outs (they have small brass plugs in them, cut into the bell mouth) up with resin and smooth back.
_________________
If I have to take the carbs off once more...