HEI conversion problem: no spark while cranking

Hi FABO Mopar Gurus,
I did a forum search and found some interesting bits but, not my specific problem. Such as Smokinnjokin's thread. So here's the setup:

340 with OEM distrbutor.
New pickup coil (280 ohms according to my meter)
New HEI module (activated by a relay)
Blaster 2 coil. (.7 ohms primary, 12K ohms secondary)
New Accel cap
New Accel rotor
New 8.2mm Taylor spark plug wires

Immediately after installing the listed parts, went for a drive.
When the car is running 70 mph, idle, cruising or hard acceleration: it runs great.
Cold start was o.k.
Hot start o.k.

Get in the car, yesterday (second trip after installing the parts), cranks and runs, no problem.

Hot start: won't run. No spark at coil wire. (replaced the HEI module with a new spare. Still no spark.)

After checking for power,grounds, Ohms, did not find a problem.
Removed the distributor and spun by hand (pickup connected, ignition "on", etc). Lots of hot spark coming from the coil wire.
Reinstalled the distributor. Cranked the engine and as it is cranking; there is one, lone spark from the coil wire. Nothing else.
Reconnected the coil wire to cap. Cranked and cranked, finally it 'caught' and ran. And ran great all the way home.

Why the "no spark" during cranking? (or just a single spark in one instance).

Pickup gap is .016", no advance. It's .008" at full advance.
Module has a decent ground and has the heat sink compound.