Hooker 5115 HKR (Plain)
Hooker 5115-1HKR (Ceramic Coated)

I don't mind looking this stuff up, but it's all on the internet, and with Google at hand, finding parts is probably quicker by Googling than by leaving a question on a forum.

For example, Google "66 Belvedere headers" and you'll find just about anything you need.

People don't seem to realize that you can also do that most of the time with engine block numbers, head numbers, etc.

Not saying this to discourage anyone from asking questions, but many questions are quickly answered with a little thought about what to look for. And, you just might get better answers than you find on a forum.