anybody who trys to give you an exact answer is a fool...like dude sez, fuel?..its just one of the variables..the kit itself plays a part, as too how the nitrous hits the cylinder..engine heat, load, and rpm play their parts..
the basics are as known..when ya get to where its good, try adding 2 more degrees at high rpm..its the midrange and low speed that kills ya..it takes time for the juice to break down..
a 36 nitrous jet should yield close to 400 hp in a nos style kit..sounds fun on a 535 with good heads..