Okay, I'm posting this 68 convertible to make an observation.
It is a 327: yes, with a four barrel, but a PG transmission. Most of us would say "That's not an HP car with a PG transmission."
Well, AACA does not consider transmission in determining classes and does consider a 275 hp car to be High Performance.
I spoke with the owner since my 68 is in the same position. He did get the award he was after, as did my car several years ago.