Shut off while driving, cranks no start

Hello everyone.

Really could use some help with this one. My C2500 5.7 Vortec. 340,000 miles, I was driving home from work truck running perfect. Without notice the engine shuts down, I drift off the road and tried to restart. No go.
I cycled the key and did hear the fuel pump prime up, The pump is one year old. So the engine cranks but no start.
Well still no spark, compression is good. Replaced crank, hall(distributor), coil, and ignition module, rotor and cap. I replaced the ECM, on the L/S engine compartment. Pulled number One plug, rotated engine until mark lined up on timing cover with mark on Harmonic balancer. Pulled Dist. Cap and saw rotor is pointing to #1. I have 12 volts going to each sensor, and a good ground, I could not find the 5 volts at the sensors when key is in the "run" position. There are and were no "CEL" at anytime during the drive when it cut off and still there are none. I used a "GM Tech 2" scanner and no codes where present. I am thinking a jumped timing chain, thinking that would misaligned the crank sensor and the wheel, never sensing the timing spot on to firing the cylinders. I am lost with this one. Can anyone help out. Thanks in advance.