With that low compression bottom end, I would run the thinnest head gasket that I could, which is the Mr Gasket 1121G. The new heads should be good and flat, and if the deck is checked for flatness and is OK, then these ought to seal OK. (And you can always put on some copper coat spray or Hylomar.) Even with the smaller chambers, that old low compression bottom end is not going to push much past 9:1 static CR.
