Transplant xperts Help – no spark!

[CatSkynr]

History –
2001 LS1, 4L60E and PCM xplant to a 1970 GMC

Aftermarket Tank
Aftermarket Fuel pump wired to PCM fuel pump relay
Disabled VATS, rear O2, AIR and AC.
Aftermarket Gauges are not installed yet. That’s all that’s left.

I get good fuel pressure, engine cranks,
I get RPM on crank, injector pulse widths look good
but no spark.

I do not have the BCM. Is this the problem even with VATS turned OFF?
Is there any other thing I’m missing here as to why the coils won’t fire?

Help! What am I missing?

[CatSkynr]

Got it working.

Was the coil pack ground. There was 9VDC on it. Don’t know if it was the PCM or the aftermarket harness, but logic probed the coil fire signals and they were goodwhen trying to crank, just no ground ref. Ended up just cutting the ground wires for both banks and clipped them to chassis and all is good. Runs like a champ!