Glad to hear that you're not willing to "practice" on the street. Unfortunately there is no way we can answer that question for due to all the variables involved, tire condition, weather the day you race, track prep the day you race, etc. Even the guys with a similar setup can only guess as a lot of the variables are specific to the particualr track you're at and the particular day of the race.
Your best bet would be to try to get to a test and tune sometime before your race and play around with it, try different launch rpms, launching techiniques, etc., that will give you a much better starting point than any of us can provide. If this isn't possible, use these Flashlight Drags as a test and tune and postpone the sibling race until you get more seat time. Have fun but be careful, Vettes are not to be taken lightly, lol.
'14 F150 4x4 SuperCrew 302
'11 GT MT w/ 3.73s and some bolt-ons 550 RWHP / 490 RWTQ 11.94 @ 123, 1.84 60 ft. Wannabe Sleeper