Flicker flutter

Glenn’s HC said
Folks , 68 Barracuda , has been upgraded some years back to typical mopar electronic ignition, recently new alternator ballast and voltage regulator. I haven’t had the car too long and never got the chance to drive it at night until after some of the parts changes .

Glenn’s HC said
However , the lights flicker with acceleration, more pedal , faster flickering , all lights not just head lights . At idle it’s ok .

What does your Ammeter show, discharge or charge, under these conditions?
If it is in discharge at idle and no flicker I would suspect the alternator.

Glenn’s HC said
The flickering are in sync with engine revolutions. All grounds are clean and good. No faulty or crusty connections Any where that I can tell . Ignition coil is stock, ignition wires are 8mm performance wires. No radio noises or interference detected

This makes me feel like there is a LARGE draw during the revolutions of the engine, or the output from the alternator is not being rectified correctly.

As asked earlier what does the ammeter do at higher RPM.