Yeah, I do know it's a 340 - saw that in another photo of the side.
Now the casting date looks to me like 2/11/71, with clock below it denoting when. Right ?
FWIW, I'm 2 1/2 hours from the engine - just trying to help the owner figure out which spec it is.
Intake manifold has been changed, & maybe the carb and/or single-right-side air cleaner - both intake & air cleaner are orange.
Might have to look for VIN on pan rail, but the front info on my '74 was in a line.
There's an interweb photo of one with the info on 2 lines, so more sanding, I guess.