Summit's 340/360 to /6 K-member conversion Kit 60$ (Thumbs up)

Just found this post and wow, looks like a solution to adding a 360 to my Duster, but is the 74 basically the same as far as the motor mounts go? I would love to order the mounts and headers from summit and be done with everything except finding a driveshaft.... Now, if the mounts between 72 and 74 for the 225 are different, why does Schumacher say his work from 67 to 76?