I am sure the pump will spray alky thru the nozzles but the pressure will be less than 150 psi thru those nozzles. Your best bet would be to bench test it thru the nozzles and see what pressure you get. I had a 150 psi pump from a different vendor(although I think they are both the same Shurflo pump) a few years ago and it made about 130 psi thru a single m15 and then I changed to a pair of M10's and pressure dropped to about 110 psi. I ran mid 10's with the set up in a full weight GN and never had an issues with it. The pressure is not as important as the volume of alky that you are getting. When I swtched my car to the two M10 nozzles I was able to run more boost safely because the volume of alky increased even though the pressure went down.
