I would wait for the real experts to chime in, but if the distributor shaft isn't turning, then either the gear is gone (or spins on the dist shaft?) or the
oil pump has seized. Either should be very easy to check by pulling the distributor. I know on my car (after it's been sitting for a while and isn't ready to fire up
) that when I'm turning it over with the starter, I'll get
oil pressure - when you're turning the motor over, are you getting
oil pressure? That would point to the oil pump.
Best of luck, and I hope it's something simple. I had similar symptoms a couple of weeks ago, and it turned out to be a bad connection in the coil wire at the coil.
JLW