I'll second what bison just said.
From day one of racing any of my Turbo Buicks with a 27" or 28" tall tire, I never shifted into OD with the 200 trans and Art Carr 9" non lock up converter. Drive is the correct gear to be in, unless you are manually shift the 2-3 because of higher rpm capabilites. Which of course your current combo does not offer. By manually shifting, this means launching the car with the shifter in 2nd, letting the trans shift the 1-2 by itself, then you shift the 2-3 when you reach your shift point as told by an aftermarket tach and or shift light. Still you wouldn't shift into OD tho. You have a 10 second car on the foot brake if you launch harder and leave it in drive.
E-brake is your friend...
I recommend the Power Logger and the LM-1 Wide band setup. Might want to ask Full Throttle if it is compatible with the LM-1 and datalogging. I bet it is, but not 100% sure.
Patrick