After installing new wires, rotor, cap, and a Pertronix Ignitor, I proceeded to set the timing. I disconnected the vacuum advance , plugged the hose, then started the car. The initial timing at idle was approximately 14 Degrees BTDC. I revved it up to approximately 4500 RPM, but the timing only advanced 10 to 12 degrees (24 - 26 degrees total timing.( If memory serves, the centrifical advance is supposed to add about 20 Degrees of timing???) My trusty instructions from Southern Automotive call for 32 - 34 degrees of total timing. Any suggestions on what I should do next? Appreciate any input...

Bob