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Thanks, fellas!
Yeah, I absolutely hate the situation with the water pump and I'll address it in the next episode.
That said, I spoke to another builder and E31 restorer here in Germany (Wokke) who's been doing these M73/M70 hybrid builds since 2014 and he always grinds the water pump impeller and never experienced any issues. So it will work.
But still, it really bugs me and I don't want to leave it like that. I ordered a pair of new pumps and I'm gonna send them to a CNC machine shop and see if it's possible to transfer over the M73 impeller on the M70 pump.
If not, then see if the coolant pipe connection can be modified. M73 has a quick disconnect hose connection while M70 has standard clamps, but the angle is different too. Either way, hopefully I'll find a more elegant solution.
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