To recap, the car was running and now it is not. The car was running on obd2 dizzy and now it is not.
Need to make sure we are all clear.
If your answer is yes,
1. Do you have spark?
2.Do you have fuel?
Start on that.
If switching distributors was the last thing you did before the car stopped starting, I'd go back to the correct d15b7 distributor.