I had already gone through and inspected/cleaned up the original oil pump for this engine, when I came across a Pelican thread mentioning the installation of a 964 oil pump into the older 2.7 magnesium case engines.
Took about 10 minutes total time with a die grinder, and the pump fits!
Now I have a Ziploc sandwich baggie full of magnesium shavings to take camping with me.
The area marked with orange paint pen is what needed to be removed.
