Ignition help - no spark

Hello all. I recently purchased a 74 Duster slant 6 that hasn't been started in 14 years. I replaced all ignition components (except ignition switch and starter) and still have no spark. engine cranks kind of slow as well. I did have a little spark last week and it seemed like it might start, but now nothing. Will dist. p/u not gapped properly cause no spark?
I am at a loss at this point, so any suggestions would be greatly appreciated. Thanks!

Yes, the reluctor gap is important.
You can temp jump a wire from the battery pos to the coil pos and check it that way to see if you have spark.
This tells you the components are good.
Then you can work your way through the ignition system to find the problem.

Make sure the ignition box is well grounded also, because it won't fire unless it is.