Are all 273 V8's the same?

seabee said

I though there was a number of 66' 273s that had the earlier bolt angle-ed heads from 65' on them. I could be wrong (and often am) but I thought I got that information here at some point..

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Yes, I own one. At least, that's what it came with when I bought the car in 1980. 8/17/65 build date '66 Barracuda had the 315 casting heads on it. It could have been changed, but, being a Hawaii car, I doubt there was much in the way of parts to be swapping around back then. It's a 4bbl car and still had the B273 block with appropriate date codes and HP pistons.