Here is a link to the 66 Mercury brochure. The 427 wasn't offered in '66 according to the brochure and other references I found, but was in '65 with 2x4-barrel (I thought that was just a dealer option, but apparently not). The base Parklane engine in '66 was the 410 cu.in. The Super Marauder was the 428 cu.in, single 4-barrel. The brochure shows the engine in red and black. Like Doug shows, I thought all Ford engines in '66 were blue (brochure artistic license?).
The AMT kit box art, 2004 re-issue, shows a stock single 4 barrel air cleaner, but doesn't show it in the instructions. My kit is open but still sealed in the bag - I couldn't see either the single 4 barrel manifold or the stock air cleaner, just the 2x4 manifold and air cleaner.
http://www.oldcarbrochures.com/static/NA/Mercury/1966_Mercury/1966_Mercury_Full_Size_Brochure/1966%20Mercury%20Full%20Size-30-31.html