I would leave the rocker cover-covers off- they are only there for valve-train noise reduction.
I actually like the native LS3 look. -- plus I would be too busy *driving* the car to open the hood ( bonnet ) anyway.
Note ; The Marine GM websites have better engine measurement info.
http://www.gm.com/experience/technol...LS3_Marine.pdf
http://www.gm.com/experience/technol...LSA_Marine.pdf
BTW: Ford Guys -- where is my 2011 5.0L crate engine >?
If you search ford racing, or summit for M-6007-M5L ( the new part number for the engine )-- you get nada /nothing /no love. . not even a "Coming Soon" reference.
Steve