Yep changed to spool mounts in 73, but the K-frame should bolt up. That would add 73-76 to the list above. I have a 75 k-frame in my 72 Demon. I installed engine to K-frame and rolled the whole thing into the car from underneath. Slick fit, no scratches, no cussing. Lesson learned was to remove A/T dipstick. The handle wants to catch on pass side of the body.