1) No

2) No, aftermarket like holley, walbro, etc are nice.......but stock autozone replacements work just fine.

3) I had to drain out $25 worth of 100 octane to work on mine, so draining $5 worth of the cheap stuff isn't gonna hurt you. Suck it up, and do it. Besides when you go to replace your pump if you don't completely remove the tank from the car, you may have gas pouring out on you when you go to pull the pump.

4) It's not that hard, Make SURE you dicconect the battery. Also make sure you get the fuel level sending unit unplugged from the top of the tank before you start. You'll have to pull up your back seat of get to it. Be gentle on the hoses and pipes for the gas lines, you do not wanna have to replace one. A handy tip is to, just lower the back of the tank down enough to get you pump out, instead of trying to completely remove it. Its less hassle that way, and you only have to dissconnect about 1/2 the hoses going to the tank. Jack the back of the car up on some stands and use a floor jack to raise and lower the tank once you've got everything loose.

HTH

~Steven