Hi Bruce,
I am using a gravity/float bowl type setup....has worked flawlessly for me in the past... (I didn't want additional pumps and things that could go wrong....)
I have a 3mm copper pipe that sits center of airflow in the air intake, coaxial to the intake manifold. The copper pipe stops slightly inside the intake port on the head (1/2" or so).... There is no constriction at the end of the pipe, free flowing...
The float bowl can be height adjusted so the level of the float bowl is around 4 to 6" below the level of the intake center (This will vary according to the length of water feed pipe you use, your air filter, and of course the air intake plumbing... also, be careful to prevent multiple dips in the water feed pipe, cumulative head is a bugger on a low pressure system) .... Adjust this height to change water flow. As soon as you restrict the pipe and put a nozzle on it, it gets prone to blocking... There is little difference in effect from mist to droplet, but droplets do work better.
With the above arrangement, there is no chance of flooding the engine, as intake draft is required to induce water...set and forget.... Oh yes, one small addition was a small valve on the water line to allow for water shutoff, seldom used, only when the tube was withdrawn to prevent spillage ultimately...
In the beginning, I shut the water off before shutting down and turned it on after warm up, ultimately, I ended up simply leaving the valve open, there was no ill effect on my system either...
Cheers
Ed