1967 915 heads any good?

They are a good head because...well, because you already have them. Of course any new aluminum head has more this and better that, but they come at a cost!! Also, IMO you can't just pull out the wallet and get some new aluminum heads and slap them on a mild/older rebuild or stock motor without proper prior planning. If you are going through your motor and rebuilding with more HP in mind then yes, by all means order some fresh heads and have them configured to your intended combo, but don't just jump on some new aluminum heads if the performance of the 915 is all you need!!! JMO, Geof