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Following some scraping with a putty knife, I've had best luck with oven cleaner (the yellow bottle is way better than the blue type- I'm thinking EZ-Off brand?, but not sure).
Basically burnt on oily deposits are the same- motor or oven. I use it in preference to commercially available degreasers when going to a car wash with a bare or partly stripped block. I would not get it on a bellhousing, fuel injection bits or SU's, so still use engine degreasers at the point the engine is still in a car.
For aluminum, EagleOne make a super mag cleaner for 'rough cast wheels' referred to as Etching Mag Cleaner with a purple strip on the label. For everything from bellhousings to really gunked SU's to D-jet injector holders, it's the ticket.
Spray 9 is the next step in cleaners- put it on once the engine has dried, not while it is still wet. It should finish up fairly well if scrubbed it the corners and high pressure washed again. It breaks down oils so they turn white and wash away. It should provide an adequate surface for paint to adhere.
FWIW, I've never had much use for WD40 in general. It amazes me it sells as well as it does.
If you do a search for early Buick (pre 64, I think), they have an engine paint color a bit darker than the Ford, and more like what you often think of as Volvo red, due to the aging of the paint Phil described.
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