Greg,
Last year I searched for new rims for my car and as I don't like the Halibrands, I tried to find another option.
First I also thought about Sunbursts - but these wheels are hard to source and really expensive.
I found the August 1965 Ford Times (see :
Ford Time August 1965, Introduction of the 427 Cobra, Online FFR Magazine. ) which describes the 427 Cobra and I decided to use also these pretty nice FIA rims on my car.
I know, the FIA rims were basically used on the 289 car, but I think they also fit perfect to the 427.
That's what I did.
All the best
Werner