Anyone know what heads these are?

I just pulled a 360 out of a Duster and the heads had no numbers showing on the top of it. I pulled them off and when I flipped them over I found these numbers 4343475. I don't have those numbers on any of my lists so I'm figuring they must be mid to late 80's. The valves are 1.88/1.6 so if anyone has any idea on what they are I'd appreciate the info. They look like they have a fresh rebuild. It's got single springs with damper and looks like chromoly retainers. I kinda want to just do a quick rebuild on the bottom half and slap these heads back on. It's got dished pistons so they have to go :D