lag... is something to worry about in 1st gear at the drag strip.
so long as you have a propperly geared tranny, you can stay in boost-range between shifts on a pretty large turbo.
a 14b is worthless on a built motor. it's barely good for any power on a stock d-series.
on a b16, i'd go with a t3/t04e .63 a/r, 57/63