Driving home from work this evening, my car backfired loudly while accelerating in first gear and died. I had to get it towed home. It will crank over fine, but will not start. I lined up my timing marks and pulled the dizzy cap, the rotor is pointing 60 degrees or so from #1. I rotated the engine over by hand one revolution just to make sure I wasn't 180 out. The rotor is now 60 degrees or so the other way from #1. I know the dizzy didn't move, the vacuum advance is still pointing straight ahead. So what happened? timing chain? This is a 351w with maybe 10,000 miles on the rebuild with everything being new at the time of rebuild. The engine has run flawlessly since the rebuild. Could it be something in the distributor?