I don't think the (10 hole) 14 x 5.5" wheels pictured in the link above are correct for '66 Hemi cars, as they have more backspacing and additional wheel cover "humps" around the rim shell. I pulled a few off '64 B-bodies.

The 15" wheels in the link are common on mid '60s pick-ups and vans.

I wonder about the (6 hole) 14 x 5.5" wheels posted by Scott, as my '66 Hemi Belvedere came with a set that appeared original to the car.