Now that I saw the two other videos it might be bad distributor rotor too. Mine backfired when rotor was melted.
Could you check and report the order of your plug wires? Have your verified your timing with timing light?
Did someone verify your cam timing is good? I dont know how it would run if not right though.
Your fueling looks fine enough to not result this much trouble.
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79 930: HX40Super, MS3pro+ID1000+044+E85, Ignition: 123/TUNE/MSD6A, BB+2*turbosmart38, WMI. Weight 1110kg
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