Heh. I used to have a ‘73 duster with three on the floor and a slant six. That was an awesome car. My only complaint was that the gas mileage sucked. The seat arrangement was the same as my Scion FR-S. The seat folded down but it wasn’t quite a hatchback since only a trunk lid opened.
My Duster has a 318 with 904 auto-trans, every factory option exc moonroof. It’s not peppy around town but on the highway watch out.
And there’s a 340 (& 727 auto-trans) in pieces in the shed waiting for $ and time.