ok so last night at about 1 am my car broke down.... seemed like it stopped getting spark... so i pulled off the distributor cap today to test my points, and found that the distributor wasn't turning when i cranked the engine... so i pulled the distributor and it spins by hand out of the car.... so i stuck a screw driver on the cam gear and cranked the motor.... no movement whatsoever.... engine is a 69 302 running in a 66 mustang... last work done to it was about 2 weeks ago, i put on a double roller timing set.... is it possible for the chain to come off or break on a brand new double roller? or am i more likely looking at more serious problems??