Sorry, not an answer but rather for clarification purposes: installed in 1981 and <strong>never used ?!</strong> Just trying to wrap my head around the situation...
Anyhow, if I remember correctly, these had electric igniters as an <strong>option</strong> and the basic install would have a pilot light. if it is, in fact, a pilot light, is it lit?
Also, just from 30+ years of storage there might be dust, a dried up star/run capacitor in either the draft inducer (the smaller motor) or the main blower, and even just generally a dried up/ gellified lubrication everywhere there's a moving part. The draft inducer motor in particular may have a really hard time starting since it's already a weak starting type and the starting capacitor is a very strong suspect - they just generally don't last that long (but then, again, it wasn't used, so who knows...)
How's the humidity been all these years? Any rust? 30 years! This must be a really warm climate location. What made you turn it on now?