I have annoyed the car gods. Sigh!

What box are you running for your ignition? I had the same thing happen to me with a msd unit. Not at 5k though. I had just pulled in to work and parked. Idling at about 800rpm it made a little pop and died. No spark no nothing. Had to get a lift home and installed the old electronics and had no problem since. It may not be your problem but thought I would throw it out there. Also just read your previous posts about your timing. Did you check to see if your dizzy is still turning?