In the carb FAQ, you can find a chart listing the original carb specs. jets, etc.
However, if the exhaust has been changed, this model with the PD carbs will likely need to be rejetted away from stock.
Best to do plug chops or a dyno run to get a fuel map. So, you can know which way the fuel metering needs to be changed.
Do you know which position the slide needles are in?