Mark:
After you get that pump overhauled, find a spare if you can. Those AC pumps are nearly made from unobtanium. I had a devil of a time finding a spare.
Never....I mean NEVER put 12 quarts of oil in an O-435. It will blow off two quarts straight away. Keep it at ten, and add a quart when it gets below nine. Folks used to howl about O-435 oil consumption until they began following that rule.
Jonathan