Volts really high with acceleration.

I had the same problem with my dart. Swore it was the alternator, we'll it wasn't. Turned out to be a poor terminal connection at the regulator 3 pin connector. I had somebody wiggle the connector as I was holding the rpm at 2k, sure enough as soon as he touched the connector the voltage changed. Wired in a new connector, no problems since. Just an idea for ya ....