Back in Sept 1969 when I ordered the Fury, I tried to get a hidden headlight grill and was told there was no way. But, I was given a quote for a hemi. For some strange reason Sport Fury's could have any engine except a hemi, while Fury III's could have any engine except a 440 HP or a 440 6-pac. I was quoted $440 for a 440 350hp and $865 for a hemi. The 440 had a 5yr 50k mile warranty and the hemi was 12 months or 12,000 miles. My wife and I chickened out and bought the 440. One of the many stupid decisions I've made in my life!
So instead of imagining a 440+6 Convertible..., try a Hemi Convertible.