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i have the small (street) LG longtubes, b&b exhaust and a cold air intake. It made 426/390 with the stock injectors, 420 on 42#s tuned like crap. This is in Texas, the shop temps were around 110 degrees during dyno.
G5X3 is "rumored" to be around 234-236ish intake and around 242 exhaust.
I have a Vararam, Ls6 intake and heads, G5X3 cam and long tube headers. I made 420 RWHP. Not sure if the G5X3 is a daily driver cam as stated by previous posts. It is aggressive in both lump and wanting to surge forward. As a weekend warrior is it great but I cant imagine sitting in traffic with that cam.
My 2001 M6 made 413.8 RWHP with AFE II CAI, MS3, dual springs, hardened push rods, ported throttle body, LG Pros, no cats, Stingers, tuned with EFI Live. Stock heads and stock LS6 intake manifold. On two different dynos with 2 HP difference between to two.
Do you have a video of your vette with the MS3????