I just got done swapping motors in my 90 Bronco. Old motor and new one are 302s. I used all the vacuum and electrics from my old one so it shouldn't be the computer. What happened is I bought the 90 so I could put my 302 in it (302 in the Bronco had a bad piston). We just got everything back together today. I started it up and it ran for about 20 minutes, and I had shut it off and restarted it a couple of times. I was going around and checking the lights and when I had my Dad press on the brakes the trucks died. We thought it probably ran out of gas because it was really low. I don't think it was the brakes because I had pressed on them a couple times earlier. We but 5 gallons of gas in it and it won't start . Its getting fuel, but theres no spark from the distributor or coil. Any suggestions would be awesome! Thanks.

95% of the time from my experience if you have no spark it is the ignition module inside the distributer

either that or the coil itself, get a test light and see if the coil is getting power, if it is you have a bad coil, if it isn't, i would go with the ignition module