its very easy to replace them, pop the top, chips have a groove on them that goes one way just pop the lever and pull the old ones out and replace them with these.
I have a set of 740cc injectors, z32 maf, but with rev limiter, and you might want to reconsider no rev limiter, its very bad idea because one mis shift is all it takes and the motor is gone, Unless your using an msd box for the rev limiter. If so then all is well.
But if you want them i can send them to you Calum charges like $5 for the set plus the shipping cost. Let me know cuz i think calum is out of town till sunday when i tried to call him.
My chips should work pretty good with your setup as well.