Buy this 273?

The red/orange paint on the valve covers makes me think it was re-sprayed blue at some point.
1967 should be the last year for solid cam.So pull a valve cover and look for the adjustable rockers (they go for $250 to $350 now a days.) You didn't say the asking price.We recently found a 70 318/904 for $750 that was in the car and running before they pulled it for us. I believe that was a good price.Your plan on doing a rebuild on both means try for the best price/core price.