273 camshaft selection help

rumblefish360 said
A '69 273? 1st 2 years had odd bolt angles and 5/16 screws, so, the intakes are hard to come by.
Otherwise, ethier a LD4B or Performer from Edelbrock and a 500 cfm carb will handle most duties.
Now about the cam.....what gear ratio and tire size do you have? Headers or manifolds?

This is correct and good advice, and any 318 4 barrel manifold will work from 67 up. There was a 318 Polysphere before that, those manifolds will not work. Valve springs will limit RPM so if you are not changing them go small on the cam.