Do you mean about being lined up with the carb that is the shower head that is bolted on where you air cleaner carb thread is...?
Yes. Here are some pics of that system installed. You can see how you could get it wrong.http://www.carcraft.com/techarticles/116_0504_hidden_nitrous_kit/photo_04.html
As for being rich well that is good in one way but no good for performance i guess.
No, its not good in any way. Not only does it reduce performance, you also chance damaging the ring lands of the pistons. The included jets can be reworked into safe, usable tunes.
Do you have any solutions or an alternative with a nitrous kit as he hasn't brought one yet!?
Not really. If he doesn't have room for a plate, the only other option (than the Top Shot) is a direct port system. They do make them that install on the bottom of the intake, but that is a little much for a 100 shot.
Its a shame he doesn't have that extra 1/2" of room for a plate. Plates can be hidden pretty well.