has anyone used or heard of how well the noszle system works

 

this is the NOSzle kit
http://www.holley.com/08201NOS.asp
as close as you can get to a direct port with out drilling/tapping the intake

several different manufacturers make this style kit.

It places the nozzle under the fuel injector.

 

yes the NOS ZLE the fuel injectors sit right down in the NOSZLE

 

>would there be a clearance issue with the length of the fuel injector and the "NOSzle" fuel/N2O ports and the fuel rail?

 

Yes. The fuel rails need to have standoffs fabbed and the distance between the two rails narrows as the rails rise so you have to shorten that crossover tube. I have a picture somewhere. I will try and remember to post it tomorrow or the next day.

 

The shop that built my engine used the NOSzle system in their 7.0-second PRO5.0 Mustang. They tested to verify that the NOSzles did not interfere with the injector spray pattern. They also tried the NOS nylon tubing for the nitrous and found it worked surprisingly well. They did limit the NOSzles to nitrous only, but that's because they prefer dry systems.