As I found out yesterday I need a reverse rotation 289 timing cover (the new one I have is wrong) and the reason for the 289 heads is originality, yes I could bolt on some AFR heads and get more power but thats not my build. They will be 'worked on' and have new valve guides and hardened exhaust seats put in. I will also port them to some extent.... one thing I did notice as the pallet was delivered to the pavement by my house is that the cast iron heads are fing heavy......