well d series vtec or not is slow as shit to me theres a d15 wich is non vtec and a d16 that is vtec and both to me is slow!
i have a b18a wich is a ls motor its ok but better than d's and more potenchal, what i would have gotten if i had more money is a b18c i think thats it is but its the gsr motor little more than the ls swap but more HP!
with your b16 i would deffenetly put d series out of your mind!
and for the 1/4 mile i dont know i would think if you want upgrade to the gsr but dont go down to an ls or d's
dont know that much but i think thats rite, ppl feel free to corect me!