Anybody use one of these water pumps?

I have a PRW water pump and am experiencing an interference fit with the casting around the impeller and my timing chain covers. My timing chain covers are from 1980 to 1983 318’s.
I can do some “massaging” for clearance...... No big deal but, has anyone else experienced this?

Check posts 9 and 12, both referenced interference, not sure if it's the area you're having an issue with.