No Spark

Driving down the freeway, engine cut, almost instantly, just shut off. Tried to see if I had fuel, air, spark, got no Spark. Using a cheapo Chinese hei distributor on the 318, I bought it years ago and have been meaning to replace it with my factory electronic distributor, but haven't gotten around to buying an ignition box for it yet. Any ideas on what I should diagnose in the morning would be much appreciated. Haven't looked to see if the rotor is turning, but I'm assuming my junk distributor would have broken vefore my cam gear did