273 correct heads?

Thanks to all of you. ...the reason why I was questioning if the heads were correct was because they have hydraulic lifters. So is it correct that the 273 came with adjustable rockers originally? Or did some come direct from the factory with hydraulic lifters.

Up through around 67 they came with adjustable rockers. I believe that changed in 68/69 which was the last year for the 273.