first off, calipers with pads go up front.
the rear has shoes with a wheel cylinder pushing them.
the line might not be to bad, depending on where it has been, but a good
line wrench, and some pb blaster, and you should be fine.
just keep bumping the wrench, instead of just pulling on it, the jaring
action will help break it loose.
you can buy new ones for about 10-15 bucks, so it doesn't mace sense to
rebuild them yourself, but thats just me.
im curious, what motor do you have, and it it the original engine?
hope this helps