Then I'm odd man out. I've owned 10 or 11, 65/6 mustangs with 289s. All of them had original heads. Maybe it's a bay area thing. BUT if he has 289 heads on a 289, they are 54 ccs.
btw, I bought Canfield aluminum heads for my last 289. When I pooched the 289 crank, I decided to stroke the new...