Few tech questions about my Duster

Okay, I have a few things I would like help on.

#1, What should I use on the floor to paint on to make it so it will not rust? POR-15?

#2, I had water leaking in on to the carpet, it caused a little rust issue that I would like to take care of, where are the most common places for water to leak in on the front floor?

#3, Who makes a decent set of rear disk brakes for a large bolt 8 3/4? I don't have a ton to spend and have been thinking about pulling a set off of a ford exploder. I can get the whole set for around $50 that way. Whats the best way to go?

#4, Are rear sway bars really worth it? I think i already know the answer, but other opinions are welcome.

#5, What is the best value Electric fan? I would like to run an electric so that it has a built in fan shroud and it helps with power a little bit.

#6, Should I run the carter Thermaquad or a Holley?

#7, Why are these damn cars so addicting?????

Thanks, Jeremy