Can Anyone Identify This Intake

Looks like the carb mounts backwards on that particular intake. Maybe rare???

They churned out a bunch of 340-4v in the 1970 MY. The choke pocket was always on the passenger side to keep it from getting tangled up with the throttle and kickdown linkages. The MY 1970 340 used the AVS carb. I think the secondary holes on this manifold look a little larger than the primary. Yet, not large enough to suspect a TQ had been mounted