Plugging Timed vacuum advance hose

This is all very interesting. Many years ago I rebuilt my 69 4 speed Barracuda's 340 with a Comp XE268H, Eddy Air Gap, headers, Eddy 750 carb and a Mopar Performance Electronic ignition setup. I followed the instructions for the ignition. The instructions said to unplug the vacuum advance and set total timing at 32 - 34 degrees at 2000 - 2500 RPM, and I did that. I did not fully understand timing at the time, so when I later hooked the timing light up at 2000 - 2500 with the vacuum hooked up and saw 50 degrees, I was concerned. I called the Mopar Performance tech line and the guy told me that was not good and to just unhook the vacuum line. He said the engine would run better and that a performance engine did not need vacuum advance anyway. So, since I apparently made the mistake of assuming the guy on the tech line knew what he was talking about, I've been driving it with 34 degrees timing (no vacuum) at about 2500 RPM ever since. It seems to run OK, but from what you guys are saying, 50 degrees total (vacuum plus mechanical) at 2500 RPM is OK and I SHOULD hook up my vacuum line. After reading that article, I now understand that I will still have some vacuum advance at 2500 RPM so the 34 degrees I set with the vacuum unhooked will become about 50 when the vacuum is added in. I also now think I understand that and the vacuum (and the associated vacuum advance) will disappear at WOT, and I will then be left with 34 degrees of timing. Does that sound about right?