Ha! My first car had the same engine GM dropped in the Tempest body to make the Tri-Power GTO (389 c.i.).
My car's 389 was the "uni-power" version though.
2-barrel carb.
^ Bonneville shown, but my Catalina looked the same. Trunk was big enough to rent out on Airbnb.
What was your first car, and first eco-car?