What's the Max shot....
 

of NO2 I can run on a stock bottom end? I am running a dry shot.

Keep turning it up until it blows. Then pull it back a bit.
The number you are looking for can be allover the map, depending on your setup

My 3 answers would be:
1. call the man in your sig and ask him
2. go wet shot
3. 250+ (on a wet shot) with a good tuner

150 hit wet or dry with the right tune or timing pulled. With a dry kit you will need bigger injectors need more fuel with dry kits.

It is all about the tune. Like seriously. If you don't have the knowledge, find someone that tunes fast nitrous cars, not just some one that pulls 6 degrees of timing while you spray a 150 shot on the dyno and hands you a print off... through a stock style intake 250hp worth of nitrous is the most I spray and expect it to last. A single plane with better distribution, 3-400 has worked for lots of people

How much fuel system do you have?
Dry setups require big injectors and lots of pump to support the flow required.
Beyond that as others mentioned, it depends on lots of things.
You spraying it all through the TB or is it a direct port?

The motor will probably handle more N20 than you think, but it has to be done damn near perfectly to keep it in one piece.

It is a fogger that goes through the intake lid and then through the throttle body.

I have a walbro 255 fuel pump and I have ford fuel injectors but I cant' remember what color they are.