Installed distributor - Now it makes a bad noise

Hello,
Looking for some help from you guys. I installed a new distributor in my 73 duster 318. I'm getting spark now which was the original problem, but it still won't start.

The sketchiest thing is that it periodically makes a grinding/screeching noise when i'm turning it over. Whatever is happening physically stops the motor turning over. I can't tell where the noise is coming from but is pretty loud. After the noise/rotation stop the motor will turn over normally. There does not seem to be any pattern for when this happens. I'm scared to actually get it fired up.

The distributor looks like its fully seated and the hold down is tight. Could the distributor shaft be binding somehow? Kinda sounds like the starter is wigging out but the problem only manifested when I put the new distributor in.