Hey Manuel. At the risk of sounding picky, I believe what you have is the UH-1C, not an "E".
But, depending on which "E" you want to build, it can be done with the kit.
According to "UH-1 Huey in action", the first 34 "E" models were the same as the Army "B" model. You can use the Cobra Co. "B" backdate set to make one of the early "E"s.
After that they went to the "C" model as the "E".
The Marines used them as "Slicks" AND "Gunships". They also had a rotor brake and a roof mounted rescue hoist, although some of the "Gunships" had the hoist removed.
Many of the "E"s were fitted with the TAT 101, twin 7.62 machinegun turret.
I'm sure that someone out there in "Modelland" can add to or correct any misinformation that I may have given you.
As far as any decals go, I don't know of any. But again, I could be wrong.
I hope this helps.