Thanks for the info. I didn't want to order my clutch setup until I verified I could interchange. My plan is to rebuild the #'s 383 and use the 440 until I am done with that. The only thing I noticed was that the flywheel center hole was really snug. I could get the bolts on fine but it wouldn't tighten all the way up. I may have to buff one or the other to get it to slide on the crank a little easier. Should I have to smack that flywheel with much force to get it on? I wouldn't think so.