one or two
With your size you are fine with just one delivery point.
Somewhere between 150 and 200 hp you start seeing advantages to splitting up the delivery points with multiple nozzles. Each set up is a little different though, so there is no concrete point of demarcation.
The advantage starts off small, and grows with the size of shot you're using.
By the 200 hp mark you are usually to the point where it's worth it to split it up. It's certainly not a must-do though.
By "advantage" I mean better dispersion of the N2O and less ice-clumping.
Your MAF will have a more stable/consistent reading, and theoretically the N2O distribution would be improved, - as in more even.
Every set up is a little different due to many small factors that aren't so easy to predict.


