Drivetrain aside.
The carb is good enough for it to run standard. Its not working any harder supplying fuel or air with the NOS setup.

will it have to be jetted rich or is there a way to add more fuel when the n20 kicks in?

or is that not an issue?

I wouldnt bother trying to regulate fuel through the carbie. It already drives perfectly with out NOS, so why make it run poor without it.
If you are injecting NOS through a fixed size jet underneath the carbie. You might aswell inject the required extra fuel through a fixed size jet directly beside it. Thats the whole reason why you use a seperate fuel system.

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lets clear things up.

there are 3 types of nitrous systems.
Dry, Wet and direct port.
The Dry system is purely a jet (or 2 or whatever) that is put in the intake (usually 12" from the throttle body from memory) that supplies only N2O.

The Wet systems are a fogger nozzle that is also placed in the intake. however these systems supply a seperte fuel (usually of very high octane content) aswell as the N2O.
the benefits of the wet system is that it reduces detonation more than the dry system.

There is also a Direct Port system that is a seperate fogger nozzle for each cylinder. these nozzles are put in the intake trumpet (close to the injector.
these are even better systems because of the greater amount of N2O supplied by the extra nozzles aswell the N2O is "fresher" (closer to liquid) which creates a denser charge which helps combustion etc.....
these direct port systems are good for up to a 200hp kick!!

Now, back to the issue.
A 50hp shot would be a dry system, which means that no extra fuel would be added.
however more fuel may be needed because of the more oxygen present.
so as mentioned in a previous post an electric fuel pump and bigger lines may be needed.
the jets shouldn't need to be touched, as long as they are big enough to keep enough fuel for the added oxygen in the chamber.

In my opinion i wouldn't put nitrous oxide on a stock A15 or any stock engine until it had a few other mods.

Yes lets please clear things up.

1] Why would you say a 50hp shot of NOS would be a dry setup?
2] Dry setup on a carbie fed motor. Please enlighten on how you would setup the fuel delivery from the carbie. Might aswell run a blowthrough turbo setup if you are going to all the trouble.
3] Your opinion you wouldnt put NOS on a stock A15. Why would that be? Have you ever run any form of boost through a stock A series?

Education or Experience is the key.

i'd wonder if the stock exhaust will even flow enough to allow 50 hp.

Along the lines of the questions Phunk posed.

There is now way you would run a dry system with the carby. You would run way too lean because you would have no way of adding extra fuel with the carby.

The only answer is a "wet" system where you are adding extra oxygen plus extra fuel at the same time. You don't necessarily need to use fancy fuel either.

ya... i thinking will be too lean also
since there is more oxygen flow trough, but the flow blow same amount of petrol from the jet at the carb

so only way is to run a wet setup?
can i direcly inject n2o and petrol at the intake manifold straight after the carbie?

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Righteo:
1) i would say a 50hp shot would be dry given that i said a direct port system is good for up to 200hp or more.
i haven't actually ever put nitrous in a car but i have read plenty of magazines and "how to" articles to know that a dry shot of nitrous is good for 50hp and above.

2) i'm not to sure phunk. lets say it cant be done. now that i think about it you would need a wet setup, because these things have no O2 sensor and cannot detect the extra oxygen in the mixture

3) I've always considered N2O a bit "plastic".
call me strange if you must, but i would rather have an engine that had stronger 'rods, billet sleeves, forged pistons, shaved head and a lumpy cam that pushed alot harder constantly, than a stocky with a shot of N2O. its just my opinion, and if you want to criticize people for having one, then go ahead.

heres my two sense worth. my buddy has a kharman ghia this two webber 32/36's on it. he had an aircleaner cover(small rectangle, chrome) that has a 50hp wet jet in the top of it. the easiest setup ive evrey seen. had 1 feul and 1 nitrous inlet on the nozle. i put that on my a14 with a webber 32/36. oh yea its worht it. dont tune the carb. just run a wet setup. if you just use nitrous your not getting the reaction you should, so it only super-cools the intake air. when you combine the nitrous and feul in the nozle, as soon as it hits oxygen it reacts and forces 50times more oxygen(not air) into the petrol causeing the increase in power. a fogger that only cools the air also creates feul starvation and can cause it to run worse.