Many head and block castings (all engines) had splotches of paint on them prior to the engine paint being added, probably denoting some type of machining process or QC inspection process. This is an original paint engine, that pink paint under the orange is the same type as your engine has.
Cool.
BTW, this is how I cleaned up the heads in my kitchen: After scraping off the thick crud with ice cream sticks, I applied a few coats of cooking oil with a tooth brush and wiped off. The cooking oil works pretty good.
If you don't see two dolphins, you need a vacation.
