Been trying to get my distributor put in and it's been a struggle. I thought I finally got it in but now see a set screw looking thing up against the distributor gear. It's facing the lifter on the eighth cylinder I think. What is it and why is it interfering with the distributor gear? Can I just screw it in further or is it supposed to be there? I tried gently turning the engine around a bit but it is not moving.

Brad
Sierra Vista Arizona
1954 Lincoln Capri