If mud didn't hurt anything water won't hurt neither.
Since yours is distributor less not much to worry.
I agree with Saltwaterwop no pressure washer under the hood, well the radiator will apreciate some pressure wash!!
What I have found works well for cleaning under the hood and around the engine is a very diluted mixture of water and "marine clean". Mix about 2-3 cap fulls of cleaner to a gallon of water. Using just a garden hose, wet down the entire engine bay, underside of the hood, ect. Being sure not to spray too much at the alternator or directly into the air intake/air filter. Then using either a spray bottle or pump sprayer soak everything that is dirty in the cleaning solution. Let it sit for 5-10 mins but don't let the cleaner dry onto the surfaces. Then hose off the cleaner. There may be some trouble areas that need a scrub but the "marine clean" is good stuff and cleans really well.
I've washed many engines for many years. Just plug the intake. The only thing that has caused problems as indicated above is a pressure washer. Just use a garden hose. The pressure can force water into places that a hose otherwise would not. (Don't worry about the alternator. On the jeep and on most vehicles, it is right behind the fan. Do you know how much spray it receives in the rain and if you hit deep water?)