injector rebuilding

[1956olds]

I see small bubbles around the lock down nuts on a few of my injectors on my port engine,i am also running about 100rpm lower than the starboard engine at wot.The boat is out for winter and i am thinking of having the injectors rebuilt,just curious if anyone has a preferance of who does them.A boating friend of mine has a sister who rebuilds the pumps and injectors in the same city where i store but looking for opinions at this time.Any idea how much this should cost? I am pretty sure i can remove and install them myself,any tricks to that appreciated also.
Also any one know what i will need to clean and rebuild my 3 racor ma 500 fuel water seperators,they have slime hanging down in them when i drained them off today.Thanks Glen