School me on supercharging a 360

Like I said rumble, I know next to nothing on this type of setup. I thought that all blowers used blow through carbs, but after thinking about it some more, that would be the type of carb a Paxton would use as opposed to a roots type blower would it not?

Wouldn't the blower have a tendancy to suck in rain water if it's sticking out of the hood?

Jack