What engine setup (blown small or aluminum big)

So everytime I look at my car I come up with a new plan for it. I have a 67 Dart that currently sits with a more or less factory 318 (4 bbl intake) and a 4 speed. I want to turn the car into a real ground pounder, but I realize that I will be driving it on the street quite a bit since there is no way I could resist, lol. I was looking at trying to make around 500 hp, though more is always nice (maybe a nitrous shot on top for around 600 for racing). I plan to drag the car every once in a while, maybe 2 or 3 times a month and would like to shoot for 11's or 10's to beat my friend's Mustang. I am mainly concerned with keeping the front end light so I can drive the car on the street without awkward handling. I toyed with the idea of a stroker, but I've always wanted a supercharged engine, so I looked into that as well. I found I could make around 500 hp on a small block with a supercharger without too much trouble, but it's $5000+ for a supercharger kit and a fair deal more for good heads and other engine goodies to match it. Then the idea of an aluminum big block crossed my mind. I could make tons of power and torque on engine alone and still keep the weight down, but the block alone is around $3000. What do you guys think? I would think a big block would be better suited for town driving with all the torque it has to spare, but is shoe-horning a big block into a Dart going to cost more in the long run? Would an all aluminum big block come out cheaper than a supercharger small block or would they cost about the same the in the long run?