It was fast...raced it at Austin Raceway Park (no longer) and won several times. As I remember it was very close to the F/SA record of that year but alas the next year (67) the record dropped by a bunch. By then we were in Seattle broke and sold it.
Oh well
It did have the 273 badging on the front quarter panel between the fender well and door. I think it was a 270 but I cant be sure. Looked like that.