Engine locking up??

Well guys - the engine is out and on the stand. I checked it soon as I got it out to eliminate any problems with the transmission or torque converter. Same interference. Turned it over and pulled the oil pan. Not as much interference. No problem with the oil pickup. Then I noticed the crank journal was real close to the oil pump. I turned the crank but it didn't seem to be hitting. Very little interference now. Took the oil pump out. Still the same. Every time I turn this freakin' thing there's less interference. Then I turned it and the oil pump shaft didn't seem to be turning. I had to use a brass drift to persuade the oil pump/distributor shaft out. I was turning the engine while tapping the gear/shaft out.It came out and looks OK. Maybe it dropped down when I turned the engine over?

Should the gear be that tight coming out? Most Chebbies I have worked on, the gear just falls out.

Still scratching my head! Oh - no interference now!