84 has a vacuum advance 89 has an electronic advance Thats the only diff.
Yes it is.
NO they are not the same.
NO. Depends on the year. On the pre-fuel injected motors, all Chevy V-8 engines used the same distributor. Use some common sense, a 1968 distributor is not the same as a 1980, but you get the idea. Use one from the same era as your vehicle.
It is the samething. same distributor.
same as a 350
305 is the same distributor as a 350 will even fit some big block chevy's.
YES.
At the base of the distributor, there is a tab, with a bolt in it. Tightening or loosening this bolt, will do the same, with the distributor. The distributor, by the way, times the motor, so, you will need to retime it.
The same as it was before.
negative side of coil, or if electronic distributor it will have a port on the distributor, then its power wire and ground and then same for lights
Yes there the same.
If the coil looks the same you should be able to use it and only if the coil isn't mounted in the distributor.