m30 engine

Hello All, I’m buying the engine shown in the attached photos. After doing some research online and on this forum, I believe the engine is indeed an M90. The block code is 1304239, I see the nice 3.5 imprint, and the date code is 2D79 (April 2, 1979), which seems promising. It would be great...

Hey Guys, didn't wanted to make separate threads for every single question about M30, that is in my head, so decided to make one general discussion. I hope you don't mind. Any input is welcome;) So, question for today is: Which oil pump is technically better, more efficient, reliable for M30...