Your car originally came with a 34 pict 3 carb. Possibly a 34 pict 4 if was originally from CA. You are right about the seats being from a Rabbit. In 74 the seat tracks and seats were changed into what would be used on the Rabbit in
- The rabbit would also use quite a few parts from the Beetle, all to save cost on a new, risky endeavor (the type 4 was a sales failure, and along with the type 3, Ghia, and Thing, were discontinued in 73 &
74). You can switch your seats with any 73 up beetle, or super beetle, or any A1 rabbit, jetta or Scirroco. You can buy new seat guides to stop them from wobbling.