how much nitrous can a stock b16 motor handle, the nitrous kit is a venom vcn-1000 dry kit thanks

I wouldnt go over a 50 shot, on a dry kit.

and how much if i got injectors, fuel pump, spark plugs, and regulator, how much could i run?

Adding a little more fuel, and the colder plugs, I wouldnt go more than a 75 shot, on 92 octane fuel. You should still be running 92 octane on a 50 shot. You could even bump to a 100 shot, if you run 100 octane or higher fuel.

is the mixer stuff that u add t the fuel to up the ocatane does that work good? or do u recommend gettin it from a gas station that has 92 octane

The NOS octane booster works fairly well. But if you go with a 100 shot, I would go with 100 octane at the least.