Weall I fixed the air leak by bypassing the prefilter and using proper fuel line clamps. The nailing is still there, almost seems louder now! I may have a bad set of injectors (I purchased some Bosio Nozzles off ebay, they came in what appeared to be legitimate packaging and the nozzles appeared new, greazzer did them up for me)....would rather pay to change those then try a lifter, since I just put the head on.