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I'm thinking you got sold a 88 pump.

Look closer, there are a difference on how the blades are pointed.

Lee tried several non GMB waterpump and didn't work for him. Since GMB pump worked, I would recommend he keep using the GMB...

Lee,

Remember, 89 pump is unique as the pulley bolt pattern is narrower than 90+. If you are going to buy a GMB pump, I would suggest going thru rockauto for a 89 pump.

ajakeski

Lee and I been though all these discussion on facebook.

The blades are the difference.

Check them out.

What Lee have currently....

Is this your current pump?
https://www.summitracing.com/parts/gmb-120-1280/overview/make/dodge

https://static.summitracing.com/global/images/prod/xlarge/gmb-120-1280_va_xl.jpg?rep=False

Any part number off the old waterpump?

Here's a new housing, but I have doubt it will fix your issue.
...

Lee already post pictures on facebook. He got a 88 pump in his 89 block.

Just buy a 88 pump.