Rear End Gear ratio

[DKz Garage]

I'm assembling all the "big" pieces to start on my 70 Camaro Pro touring project. DSE front sub and rear quadra-link suspension, 9" Moser rear housing, 4l80e trans, LSA (est 650-700hp). My rear tire height will probably come in around 27". I plan on mostly street use, but may take to an auto cross event now and again. I believe the newer Camaros run a 3:23 gear?? Any input on what gear I might want to run with this power train set-up?? I'm ready to order the center-section/gears for the rear end and can't decide on gear ratio...... I will have trans "beefed-up" but will probably run the stock gear ratios within the trans.