Help me figure out what I have!

Yeah Barracuda verts are BH27 since Hector was a pup.
The tag is definitely not original to the car. Can't think of a legitimate reason other than the inner fender was replaced using a 75 as a donor. Look for evidence of panel replacement at the edge where it meets the firewall, the front edge near the radiator core support, and the bottom above the frame rail. The whole front clip may have also been replaced. (I've done that) Look for a hidden number stamped on the bottom side of the U-shaped horizontal core support on the battery side of the car.

It's how we get by in the rust belt.