Does anyone know if all the year 2000 Z28's came with power seats? How hard would it be to swap in 4th gen power seats in a 3rd gen that does not have power seats? What would I need in addition to the seats themselves?

Installing power seats in a car wthout them is easy. If you are really lucky, there's already the wiring tucked under the rug. I wasn't lucky. All it is is just one wire to ground, one to a constant 12v supply. Try to get the wiring harness out of the donor car. I didn't so I just went to Radio Shack and got some insulated male/female connectors.

i've installed my power seats, but have yet to hook them up, there isn't a power draw with it hooked up to a constant is there?

Nah, they don't draw just sitting there.