The pity of that engine is that Ford only put it in the Mustang and, I guess, a handful of Cougars.
It would have been the perfect choice for the Mercury Marauder, the T-Bird, or the Ford XL, any of which would have made for a really hot, upscale, luxury-performance coupe. Not a big market, for sure, but Buick was putting dual quad GS engines in Rivieras, Chrysler dropped the "TNT" 440 in the Chrysler 300/Hurst in 1969, or you could order a Caprice with a 427 and a four speed.