The distributor and cam gear are helical (spiral) so the shaft rotates a bit as they mesh. You usually have to compensated when you drop it in for this slight rotation.
Also make sure you are on Compression TDC and not Exhaust TDC. Then move the balancer to 10 degrees BTDC and install the distributor.
This puts it closer to actual firing position and less twisting to dial it in.
If it doesn't go down, you may have to line up the oil pump drive with a long handle flat blade screwdriver.
We have a complete distributor install thread in Best of Powertrain archive. Used to have pictures but they somehow disappeared.
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