After cleaning, stuff them in a sealable baggie, with 5 cotton balls soaked in isopropahol alchohol. I had to keep my 5-Oh injectors in a baggie for 3 years, in a very enviroment-unfriendly barn, until I was ready to use them.
Other than the bat/owl-shit on the outside of the bag, the injectors were in perfect, brandy-new condition, when I was ready to install.