just got a 66 dart, got some questions, and i am a newb to mopar

Alright so i bought a 66 dart a few weeks ago
its a 225 6cyl all stock, im planning on driving it like this for the summer
while i gather the parts to do what i want to it

from everything ive read and everybody ive talked to at car shows and stuff
i got a basic idea that a good set up would be a 340 with a 727 and a 8 3/4 rear
and of course upgrade brakes and everything else

however i have some questions and please tell me your opinions about the best set up

1) is a 340 really any better than a 318 or 360?
2) what will i need to do to the motor to get a little over 400?
3) will a 727 mount up to those small blocks?
4) what cars came with a 727 and/ or a 8 3/4 rear that i could get pulled out from like a salvage yard or something?
5) what cars came with disk brakes all around that will fit on my dart? (im trying to do it on the cheap)
6) what all parts exactly will i need off those cars to fit the brakes on mine?
7) is there a car i could get the power steering and steering collum ect.. out of to fit in my car

any answers or opinions or advice would be great
thanks
Author: 66dart07