Go for it! Your dash air is not necessary because it won't keep you cool anyway. Run the generator and the house air conditioner. Don't worry about the spark plugs because they should be good for about 100,000 miles if your engine is healthy. Change them if you get a misfire which should send a check engine code to the ECM. Sucking water through the air filter during heavy rain can be a problem. I have the Banks air intake system and had to raise the intake duct for the air cleaner to keep from sucking in water.
