273 was solid until 68. 68 and 69 were hydraulic with non adjustable rockers. The 273 solid cam came in 2 grinds, one for 2 barrel and a slightly larger one for 4 barrel
Thanks toolmanmike, so only the solid cams had the adjustable. I recall many years ago a friend of mine had a 67' Dart 273, four Barrel, that had a solid cam, but thought maybe all did.