bkr6e or bkr6e11 same plug, only difference is the preset gap.
You can run the heater w/ out a t-stat, but keep an eye on it. You should be fine just using it to get the pressure up and then turning it off till you start spraying.
I have the same kit, just got done putting it in my maxima. Sadly i only had about 3lbs in the bottle
sucker was full of air.
What size jets are you planning on using?