Four wet nozzles would be ideal, but you can get away with two. This will save you a few bucks. Plus, with (to the best of my knowledge) the smallest shot you can run per nozzle being 6HP, a 24hp minimum boost is a fair whack. Plus with two it'll be cheaper to rejet them to up the gain.
You have the distinct advantage of being in the US, where all that stuff is dirt cheap. (Including nitrous refills)
The other apealing feature of chemical supercharging is that when you arent sqeezing it, the engine can have smooth operation, and fuel economy. I will be fitting a single fogger nozzle between the carb and blower on my datsun some time in the future.