Hey Joe,

I ended up purchasing this set-up off Bill (owner of Wrenchers hot rod shop) in Novi, MI...along with a second set of Six Pack carbs.
It was running on a 1970-72 Plynouth Duster, which is the car pictured in your post.

Is / was this your car or a friends car?

Do you know Bill / Wrenchers Hot Rod Shop?

1969 Dodge Super Bee A12 (440 Six Pack, 4-speed, Dana 60 4.10)

1972 Plymouth Road Runner (400, 4-speed, 8.75" 3.23)

1974 Plymouth Duster 360 (360, 4-speed, 8.75" 3.23)