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If you have a lid, don't worry about it. I have one becuase of my future plans to run 90mm set ups (FAST or street warrior). Just keep your SLP untill you have a 408 or bigger, and step up to either 85mm, or hell, ITB or sheetmetal i intake.
If you step up to a FAST 92 with NW 92, then yes, I would get a 85mm MAF and lid. Other than that, with your ls6 intake mani, I would just keep the SLP lid.
Yea, my lid has no problems with fitment, and seems like it was built right. Only thing I didn't know when I bought it was that I needed an 85mm MAF. All said and done, I'm happy with it.