I'd recommend a good cleaning and blowing compressed air everywhere (be sure to wear eye protection!) I also like Glyptal to paint the inside portions - under the valve covers and inside the galley but not on any gasket surfaces. A quart of this stuff goes a long way and I use Harbor Freight cheep China bristle brushes.

Glyptal 1201 Paint - The Eastwood Company

Paint the outside with a good quality engine paint.

Glenn