Any paint safe to use up to 400* works, the blower doesn't get close to that so no worries there, just use a good primer and paint and clear.

If you can drain the oil and leave the plug out so any fluid that goes down into the pan just flushes out, then once everything is together, put the plug back in, fill go for a test drive come back and change the oil again. Repeat again after 100 miles if you get paranoid. Then you should be good to go.

EDIT: Suggestion is use cheap oil for the first and second change so its cheaper. Oil won't be in long so no reason to waste the good stuff.