The Dodge Hemi's have 2 spark plugs per cylinder which equals 16 spark plugs
yes.
16, two per coil
They are under the coils, on top of the valve covers.
The 5.9 liter (360 CI) is a V8 type engine, thus there are 8 spark plugs.
The hemi has sixteen spark plugs.
yes
0.35 in according to O'reiley's.
You have to remove the intake plenum. It just unbolts.
look in the owners manual for that info.
each cylinder for the V-8s have two plugs, for better power output and cleaner exhaust.
you have to remove the plastic covering on the engine and then you will see where the plugs are, the coils rest on top of the plugs.