Those wheel specs are very common and match what I'm running with 1" spacers. If the wheels came with tires (couldn't see the listing) then I can almost guarantee you'll need to change those as I think they come with 245/55/17 from the factory which is to tall up front for your '66. They may even be a little to tall for the rear depending on your ride height.
I had to run a custom spacer on my setup to get the wheels in the fender where I wanted them. I have grenada spindles and SN95 disk brakes though. It was right around 1" which jives with what was said already.