Don't let some of the guys pull your chain.
I've been into fords for the last twenty years.
C6AE head is Identical in comparison to the HP head of 66,
chambers are the same valves are the same.
The 289 in 1966 -271 hp with a 4V carb.
the thing with alot of the newer heads is that they flow
more air. Now you can get a horse power jump if you use the older head to get more compression. And this is a easy way to get cheap hp with out tearing the whole engine apart.
But if you have money to burn the best way would be to install some pop up piston with some good after market heads/w guide plate and the whole shabam. This way you have the best of both worlds, higher compression and better flow.


~ Vegas ~