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If you examine the drive shaft and the coupler carefully, you'll see that they're both keyed. It doesn't stand out in an obvious way to a casual glance, but look closely. So long as you don't force anything, it can only be installed when it's aligned correctly with the camshaft, so don't worry about that. Find the keys on both parts, then rotate the distributor shaft to align them. When you get it right, the distributor should pop in place with no more than a mild bump with the heel of your hand. Do NOT try to draw it on with the bolts, or to otherwise force the issue, and you'll be okay.
Live well,
SJW
Edit: Looks like your post showed up while I was typing this up. Congrats. Glad you got her running again.