It does have spark plug wires. On this engine they run from the back to the side of the engine. A friend has a 55 Chevy and the spark plug wires run from back to the side of the engine. On this view you won't see it.
So, if anyone builds this engine and show the spark plug wires going over the valve covers, they are doing it wrong and it' not accurate.
Here's a picture of one I've found online.
Colors - Testor's Glosss Black, Testor's Transparent Candy Apple Red, Testor's Flat rRd (interior), Tamiya Flat Black (interior), Testor's Bright Silver as the first base color.