Ya, Meangreen's got it right.
typically the dry shot is injected in front of the MAF, it cools the sensor and the computer adds more fuel.
Wet shoots in the NOS and fuel at the same time, usually closer to the TB.
Either way, your fuel pump has to be able to keep up with the extra fule needed.
I'd say go wet KB, but either should work. how much can your bottom end/block take?
I'd also recommend you test fire the NOS throught the manifold when it's not on the motor.
the 302 IM's are known to not disperse the gas through to every runner, you may have to mess with the nozzle placement.
I'm stoked to run mine when I get it back. I'll be like a kid at xmas, learning to drive all over again.