Ya, most had 7 1/4 but the HP 273 with 4bbl came with 8 3/4 and towing package as I understand also. Later in 67 run they introduced the GTS with the 383 and it had the 8 3/4. My dart is also a 273 2bbl with 7 1/4 and the drive shaft has the rubber isolater near the pinion end but it is not directly compatible.
