What I have experienced, your results may vary:
NOS: install is easy, and truly, for the cost ? It is the cheapest way to gain HP. Keep it mild, single, maybe a progressive or at most a double shot.............on the RIGHT motor, agreed, it works. BUT it is hard on the pistons/cylinder walls. Wet vs dry ? In MY opinion based on my personal experience, wet will make your engine live longer.
Turbo's: Can and do work, my best luck has been on smaller engines like sleds or some VTEC applications. Not something I played with ALLOT, but if you build it RIGHT, they can and do perform. I have seen diesels come to life when they get the boost. Downside is turbo lag and flat spots. But hey,they work and they normally fit under the hood, but you do have that big ass after-cooler to deal with.
Superchargers: Both Paxton (centrifugal) and roots type, they just flat out make power. Depending on how big and how much drive you put into them, yeah, monster motors. Also big bucks. You need the bottom end built to accommodate the extra pressure, the drive system is not going to fit anywhere close to a stock system (paxton being a bit of an exception) and body work is a MUST. Or just lose the hood I guess. These days, I would go injection , not carbed, also you can add NOS on a blower motor. These are expensive, big, powerful and super cool to look at. Sleeper ? Not a chance. Parasitic power loss is ALWAYS a conderation.
On all of them, no matter what type, big HP/torgue means heat and allot of it.
Now....................given the context of this thread, sorta anyway.....go down and buy a beater with a heater, slap on a manifold plate with an enrichment circuit on it, say a 100 shot ? Big I know for an out of the box start, but hey, its gonna explode anyway. That's why your not using your vintage pinto you been saving in the back yard. Go out and have fun, spray it till it unloads all the pistons. It would be a sleeper. When done, rake up the motor, pull all your gear off, and scrap it. Dirt track races in the meadow of an accomondating land owner can be a great way to kill a saturday afternoon. Come on, around here ? They race tractors and have a combine demo derby in Lind every year.