The only way to make sure, is to turn on your A/C at HIGH, and HIGH-BEAMS, then rev the engine to 3000 RPM, hold it steady, and measure the voltage.

If less than 14.2 VDC, I would be suspect.

Transpo also makes "fixed" regulators- I think that's what you looked up.

FWIW, the BOSCH regulator (fixed) says 14.2 VDC (printed on regulator), but I never got that high even at 3500 RPM and no A/C or lights on.

:-) neil