Rather than type it out, I'm attaching Lars Grimsrud's excellent paper on how to install a Chevy V-8 distributor; follow the instructions and you'll have it running in no time.
Good write up on "walking the distributor rotor".....I learned this many years ago by accident and never had to use a long screwdriver to index the oil pump shaft thereafter. Like Lars said, you can walk that rotor around faster than you can find a long screwdriver. The rest of the article was very well written and informative. Have never seen this before but I'm sure going to save it for future reference and sharing.