[wrath of cron]

Hey Tom I am new to J- racing I have bought some stuff but need a little help with others. My big question is I bought a merc that has a stillwell powerhead bu I was told the gearcase hasn't been "profiled" What is "profiling" does it improve performance, by how much, what does it cost to do, how long does it take to do, if I do it how tough is it to pull the gearcase and shipp...etc Thanks